2) The image produced by a convex mirror is always closer to the mirror than it would be in a plane mirror for the same object distance. Grade 7 Light Worksheets 3.1 Images formed by Mirrors and Lenses • Images • Image formation by mirrors • Images formed by lenses Object-Image • A physical object is usually observed by reflected light that diverges from the object. As such, the characteristics of the images formed by convex mirrors are easily … Case Study and Passage Based Questions for Class 10 ... mirror Image Formation by Mirrors Give one use each of a concave and a convex mirror. To determine the focal length of a concave mirror, a student focuses a classroom window, a distant tree and the Sun on the screen with the help of a concave mirror. Concave mirror forms a sharp image, whereas a convex mirror cannot form a sharp image of the distant object. 7. Plane mirror 8. It cannot be used to produce real images. When they appear to meet at a point(the rays of light), it forms a virtual image and a virtual image is ALWAYS erect. The image is always erect and smaller in size than that of the object. Hence, magnification produced by rear view mirror is always less than 1. They are concave mirror and convex mirror. Convex Mirror and Lens If the object is placed at 25 cm in front of the concave mirror having focal length 20 cm, this means that the object is placed in between focus and the centre of curvature of the mirror. D) erect, real and magnified. B) real, inverted and diminished. In a convex mirror, the virtual image formed is always diminished, whereas in a concave mirror when the object is placed between the focus and the pole, an enlarged virtual image is formed. Lenses: A convex lens with only one lens to magnify the object. When an object is placed at infinity, a virtual image is formed at the focus. Therefore,1v = 1+f-1-u=1f+1u which, is a positive quantity. The image formed in a convex mirror is always virtual and erect, whatever be the position of the object. This image, formed by light rays leaving the flat refractive surface, is Select one: a. real and closer to the viewer than the object. Here the image formed in front of the mirror. When the reflection of an object is seen in a convex mirror the image will: a. always be real. 13. Click hereto get an answer to your question ️ By using a convex lens, a student obtained a sharp image of his classroom window grill on a screen. The first is graphical, and the second analytical. Reason (R): A convex mirror has much larger field of view than a plane mirror. Question 26: The mirror that always gives a virtual image and the image is smaller w.r.t. 1. (i) It always forms a virtual, erect, and diminished image. It is formed by concave mirrors too … A convex lens of small focal length and its primary use is to see the magnified image of small objects. Light rays parallel to the optical axis are reflected from the surface in a manner that diverges from the focal point, which is behind the mirror. An optical instrument consists of two convex lenses of short focal lengths primarily used for observing a highly magnified image of minute objects. Page Number: 171. The picture is vertical and situated at the focus point when the item is far away from the mirror. (IV) Images formed by convex mirrors are usually larger than the object. When the reflection of an object is seen in a flat mirror? Rays of light parallel to the principal axis after reflection from a concave mirror meet at a point (converge) on the principal axis. The image formed by a plane mirror is always (a) real and erect (b) real and inverted (c) virtual and erect (d) virtual and inverted Answer: (c) Explanation: Plane mirror has virtual focus. Hence, it’s a real image. 2. Write four properties of an image formed by a convex mirror. (i) concave mirror (c) Image can be obtained on screen (v) real image (d) Bottom of a tank containing water appears to be raised due to (ii) refraction (e) The lens having power – 2D (vi) concave lens (f) The lens which is thicker at middle as compared to edges (iv) convex lens (g) Mirror used as rear-view mirror in vehicles (vii) convex mirror Real image is found when the rays of light converge at a point after reflection on a mirror or after refraction through a lens. (ii) While using a convex mirror as shown, the field of view increases. Related Lesson: Summarizing Image Formation by Mirrors | Geometric Optics. Question 26: The mirror that always gives a virtual image and the image is smaller w.r.t. A convex mirror enables the driver to view such larger area of the traffic behind him. 2. always be virtual. The image produced by a convex mirror is called a virtual image. Therefore, the image formed will be an inverted image. A plane mirror always forms a virtual image. The characteristics of an image formed by a flat mirror are: (a) The image and object are the same distance from the mirror, (b) The image is a virtual image, and (c) The image is situated behind the mirror. A virtual image has the following properties: 1. Convex mirror, 3. The image formed by a plane mirror is always (a) real and erect (b) real and inverted (c) virtual and erect (d) virtual and inverted Answer: (c) Explanation: Plane mirror has virtual focus. Answer: (b) cannot be formed on the screen A different type of image is formed when an object, such as a person’s face, is held close to a convex lens. B) are always virtual. Convex mirror is used in rear view mirror. Therefore, in applications where a virtual image of the same size is required, a plane mirror is preferred over spherical mirrors. Assertion (A): For observing traffic at back, the driver mirror is convex mirror. Show Answer (a) Only plane Q16. The image formed in a convex mirror is always virtual and erect, whatever be the position of the object. As such, the characteristics of the images formed by convex mirrors are easily … Rays of light parallel to the principal axis after reflection from a concave mirror meet at a point (converge) on the principal axis. 4) The image is real if the distance of the object from the lens is greater than the focal length and virtual if it is less than the focal length. Answer: Convex Lens Concave Lens. According to the graphical method, the image produced by a convex mirror can always be located by drawing a ray diagram according to four simple rules: . • An optical system (mirrors or lenses) can produce an image of the object by redirecting the light. The table below represents the image formation of a convex mirror when an object is placed at a different position. (I) Convex mirror always forms a virtual and erect image (II) Convex mirrors may form real or virtual image depending upon the position of object (III) Convex mirrors provide a wider field of view as they are curved outwards. Plane mirrors and convex mirrors will always produce an upright image. The image formed by the convex mirror is always virtual and erect. A convex mirror always produces an erect image of the objects. Uses of convex mirrors. C) virtual, inverted and diminished. A concave mirror is used as doctor's head mirror to focus light on body parts like eyes, ears, nose etc., to be examined because it can form erect and magnified image of the object. Such mirrors always form a virtual image, since the focal point (F) and the centre of curvature (2F) are both imaginary points "inside" the mirror, that cannot be reached. Converges light. Diverges light. Hence, it is also called a diverging mirror. The image produced by a convex mirror is always virtual, and located behind the mirror. Images formed with convex mirrors are always right side up and reduced in size. Then we will get a sharp image. Virtual images are always formed by convex mirrors and are formed by concave mirrors when the object is placed in front of F. Plane mirrors and convex mirrors will always produce an upright image. An optical instrument consists of two convex lenses of short focal lengths primarily used for observing a highly magnified image of minute objects. It is inverted and the height of the image is the same as that of the object. It turns out that convex mirrors always produce the same kind of image, irrespective of where the original object is located. The size of the image is much smaller than compared to that of the object. object, then the mirror is (a) concave (b) convex The image formed from any real object is always smaller than the object. Can you explain this answer? The image formation properties of the convex mirror are given below: The convex mirror always forms a virtual image that lies between pole and focus of the mirror. A convex mirror is the kind of mirror used for security in stores, and is also the kind of mirror used on the passenger side of many cars ("Objects in mirror are closer than they appear."). It is inverted and the height of the image is the same as that of the object. In this section, let us look at the types of images formed by a convex mirror. The image through the concave lens is always a virtual image, standing like an object, and looks smaller than the real thing. This image, formed by light rays leaving the flat refractive surface, is Select one: a. real and closer to the viewer than the object. | EduRev Class 10 Question is disucussed on EduRev Study Group by 218 Class 10 Students. A real image can be captured on a screen and is formed by a concave mirror and convex lens. David is observing his image in a plane mirror. Properties of an image formed by a convex mirror: The image is always formed behind the mirror, between the pole and its focus. When an object lies between F and P: when an object lies between principal focus and pole of the mirror, the image formed is magnified, virtual, and erect. A plane mirror always forms a virtual image. 9. Convex mirror, 3. The image formed in a convex mirror is always erect, virtual and diminished in size. Types Of Images. Object at the infinity But a virtual image of an object is always formed in a convex mirror. 25% 25% 25% 25% 1 21 41 2 22 42 3 23 43 4 24 44 5 25 45 6 26 46 7 27 47 8 28 48 9 29 49 10 30 50 11 31 12 32 1 13 33 14 34 2 15 35 16 36 3 17 37 18 38 19 4 39 20 40 Question 2: To determine the focal length of a convex lens, a student focusses a classroom window, a … An image is formed when the reflected rays actually meet or appear to meet at a … A convex mirror is a curved mirror that forms a part of a sphere and designed in such a way that light falling on its shiny surface diverges upon reflection. When an object is placed at infinity, a virtual image is formed at the focus. Thick in the middle and thin at the edge Thin in the middle and thick at the edge. There is a definite relationship between the image characteristics and the location where an object is placed in front of a concave mirror. 2. always be virtual. Depending on the position of the object in a concave mirror, real or virtual images are formed. Now, let’s study the types of images formed by a convex mirror. MCQ Questions for Class 10 Light Reflection and Refraction. If R is the radius of curvature of a spherical mirror and f is its focal length, then : Question. The size of the image is smaller as compared to that of the object. A) inverted, real and diminished. Ques. C) could be real or virtual; it depends on whether the object distance is smaller or greater than the focal length. As inferred from the ray diagrams, the image formed by a convex mirror is always virtual, erect, and smaller. The virtual image formed by a convex mirror is always enlarged. i) Concave mirror:-is a spherical mirror whose reflecting surface is curved inwards. The image formed in a convex mirror is always virtual and erect, whatever be the position of the object. A plane mirror always produces the images that have a magnification of '1.' A convex mirror can only form 2 types of images when the object is placed at different positions. A case 1 image is formed when d o > f and f is positive, as in Figure 10a. So option 1 is correct and option 3 is wrong. Two convex lenses: Focal length A concave mirror will only produce an upright image if the object is located in front of the focal point. 10. 3. A convex mirror always produces an erect image of the objects. The image formed by a convex mirror is always. The distance between mirror and his image is 4 m. If he moves 1 m towards the mirror, then the distance between David and his image will be: (a) 3 m (b) 5 m (c) 6 m (d) 8 m. 3. (E) An image formed by a concave _____ cannot be obtained on a screen. Answer: Images formed by a convex mirror are always virtual. Convex mirror always give smaller image. For virtual and erect image : According to the New Cartesian Sign Convention, for the virtual and erect images formed by a convex mirror, Object height (h) is … Dec 15,2021 - An image formed by a convex mirror is always _____.a)virtual, erect and diminishedb)virtual, real and magnified c)real, inverted and diminishedd)real, erect and magnifiedCorrect answer is option 'A'. Dec 03,2021 - The size of the image formed by the convex mirror isa)Always smaller than the size of the objectb)Same as the size of the objectc)Depends on the position of the objectd)Always greater than the size of the objectCorrect answer is option 'A'. A convex mirror is a type of spherical mirror in which the reflecting surface is the bulged out portion of the sphere. The image formed in a convex mirror is highly diminished or much smaller than the object, due to which a convex mirror gives a wide field of view of the traffic behind. A different type of image is formed when an object, such as a person’s face, is held close to a convex lens. Assertion (A): Light travels faster in glass than in air. (b) concave mirror (c) convex mirror (d) plane mirror. When the object is far away from the mirror the image is upright and located at the focal point. Convex mirror: It is that in which the reflection occurs through outer surface of mirror. It cannot be used to produce real images. When an object is placed at infinity, a virtual image is formed at the focus. 4. A real image of an object is to be obtained. The image formed by the convex lens may be equal in size, smaller or larger than the object while concave lens always forms diminished/smaller image of the object. Which image will be formed when an object is placed between the focal length and the convex mirror? 25% 25% 25% 25% 1 21 41 2 22 42 3 23 43 4 24 44 5 25 45 6 26 46 7 27 47 8 28 48 9 29 49 10 30 50 11 31 12 32 1 13 33 14 34 2 15 35 16 36 3 17 37 18 38 19 4 39 20 40 Concave parabolic (b) Differences between a real and virtual image : Real Image Virtual Image It can be taken on a screen It can not be taken on a screen It is always inverted It is always erected When reflected or refracted rays actually meet at a point, then real image is formed. Answer. The image formed by a convex mirror is always virtual because it is formed behind the mirror from the intersection of the extensions of the reflected light rays and it can’t be received on a screen. When the reflection of an object is seen in a convex mirror the image will: a. always be real. Page Number: 171. Using mirror formula, 1v+1u =1f ⇒ 1v = 1f-1u Object distance u is negative and the focal length f is positivefor convex mirror. But if the object is placed between the focus and pole, the image formed is virtual and erect. If we placed an object above the x-axis then by geometry the rays will converge below the axis. (C) An image formed by a _____ mirror is always of the same size as that of the object. When an object is placed at infinity, a virtual image is formed at the focus. When the object is placed at infinity. Rear mirrors used in vehicles are convex mirrors. (A summary of the three cases or types of image formation appears at the end of this section.) (a) 1. E) erect, virtual and magnified 2. A concave mirror is used as doctor's head mirror to focus light on body parts like eyes, ears, nose etc., to be examined because it can form erect and magnified image of the object. A plane mirror always produces the images that have a magnification of '1.' Reason (R) : Glass is denser than air. The image formed by the convex mirror is always virtual and erect. A convex mirror is a curved mirror that forms a part of a sphere and designed in such a way that light falling on its shiny surface diverges upon reflection. The convex mirror has a reflecting surface that curves outward resembling a portion of the exterior of a sphere. A convex lens of small focal length and its primary use is to see the magnified image of small objects. If the object is placed at 25 cm in front of the concave mirror having focal length 20 cm, this means that the object is placed in between focus and the centre of curvature of the mirror. A convex mirror or diverging mirror is a curved mirror in which the reflective surface bulges towards the light source. This implies, the image distance is always positive in case of convex mirror and the image is always formed on the other side of the object i.e., behind the convex mirror. The image is formed at infinity. Explanation: A virtual image is always created by a convex mirror, and it is always situated behind the mirror. A) real, erect and diminished. We wish to describe the characteristics of the image for any given object location. (B) Image formed by a convex _____ is always virtual and smaller in size. Hence, it’s a real image. Hence, a real image is always inverted. 3) Concave- curves inwards. In a convex mirror, the virtual image formed is always diminished, whereas in a concave mirror when the object is placed between the focus and the pole, an enlarged virtual image is formed. The image produced by a convex mirror is always virtual, and located behind the mirror. object, then the mirror is (a) concave (b) convex b. always be virtual. Therefore, in applications where a virtual image of the same size is required, a plane mirror is preferred over spherical mirrors. When reflected or Convex mirror: It is that in which the reflection occurs through outer surface of mirror. The size of the image formed by the convex mirror is always smaller than that of the object. Question 2. Let us have a look at the characteristics of the images formed at these two positions. Location of the image is always between the focal point and vertex of the mirror. Question 1 i) Concave mirror:-is a spherical mirror whose reflecting surface is curved inwards. 3. may be either real or virtual. When an object is placed at a finite distance from the mirror, a virtual image is formed between the pole and focus of the convex mirror. A virtual image (a) can be formed on the screen (b) cannot be formed on the screen (c) is formed only by the plane mirror (d) is formed only by the convex mirror. (D) An image which can be obtained on a screen is called a _____ image. A convex mirror is a type of spherical mirror in which the reflecting surface is the bulged out portion of the sphere. upright image How can a plane mirror, concave mirror, and/or convex mirror be used to produce an upright image? Then we will get a sharp image. Unlike concave mirrors, convex mirrors always produce images that have these characteristics: (1) located behind the convex mirror (2) a virtual image (3) an upright image (4) reduced in size (i.e., smaller than the object) The location of the object does not affect the characteristics of the image. When the reflection of an object is seen in a convex mirror the image will? The images formed by convex lenses A) are always real. The image formed by the convex lens may be equal in size, smaller or larger than the object while concave lens always forms diminished/smaller image of the object. b.Convex- curves outward. SOLUTION: D) virtual, erect and diminshed. The image through the concave lens is always a virtual image, standing like an object, and looks smaller than the real thing. The characteristics of an image formed by a flat mirror are: (a) The image and object are the same distance from the mirror, (b) The image is a virtual image, and (c) The image is situated behind the mirror. 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