Practice Test

1) A concave mirror has a focal length of 2 metre in vacuum. What would be its focal length when used in medium of refractive index 2.759 ?

2) A convex mirror is used to form an image of a real object. Which of the following is wrong ?

3) While using an electric bath, the reflector for street lighting should be

4) A dice is placed with its one edge parallel to the principal axis between the principal focus and the centre of the curvature of a concave mirror. The shape of the image is

5) A person standing in front of a mirror finds his image larger than himself. This implies that the mirror is

6) The largest distance of the image from a convex mirror of focal length 10 cm can be

7) A car is fitted with a convex mirror of focal length 20 cm. A second car 2 m broad and 1.6 m high is 6 m away from the first car. The position of the second car as seen in the mirror of the first car is

8) In the above question, the breadth and height of the second car seen in the mirror of the first car, are respectively

9) A person is looking at the image of his face in a mirror by holding it close to his face. The image is virtual. When he moves the mirror away from his face, the image is inverted. What type of mirror is he using ?

10) For a real object, a convex mirror always forms an image which is

11) A convex mirror forms an image one fourth the size of the object. If object is at a distance of 0.5 mm from the mirror, the focal length of mirror is

12) A dentist has a small mirror of focal length 16 mm. He views the cavity in the tooth of a patient by holding the mirror at a distance of 8 mm from the cavity. The magnification is

13) A person 6 feet in height can see his full size erect image in a mirror 2 feet in height. This mirror has to be

14) A concave mirror has radius of curvature of 1 m. Light from a distant star is incident on the mirror. The distance of the image of the star from the mirror is

15) A spherical mirror forms an image of magnification 3. The object distance, if focal length of mirror is 24 cm, may be

16) A concave mirror of focal length forms an image of the same size as the object. The distance of the object from the mirror is

17) A point object is placed at a distance of 30 cm from a convex mirror of focal length 30 cm. The image will form at

18) An object is placed at a distance of 10 cm from a concave mirror of radius of curvature 0.6 m. Which of the following statements is incorrect

19) A convex mirror has a focal length of 20 cm. A real object is placed at a distance of 20 cm in front of the mirror from the pole. The mirror produces an image at

20) A man has a concave shaving mirror of focal length 0.2 m. How far should the mirror be held from his face in order to give an image of two fold magnification ?

21) A concave mirror, forms a real image of an object. If the whole arrangement is immersed in water. Then the image will

22) A mirror forms a virtual image of unit magnification. Its nature is

23) A luminous object is placed 20 cm from the surface of a convex mirror. A plane mirror is set so that the virtual images formed in the two mirrors coincide. If the plane mirror is at a distance of 12 cm from the object, then the focal length of the convex mirror is

24) The focal length of a concave mirror is 12 cm. Where should an object of length 4 cm be placed so that an image 1 cm long is formed ?

25) The focal length of a concave mirror is 20 cm. Where an object must be placed to form an image magnified two times when the image is real ?

26) In the previous question, if the magnified image is virtual, then the distance of the object from the mirror must be

27) The image formed by a convex mirror of focal length 20 cm is half the size of the object. Then, the distance of the object from the mirror is

28) An object 3 cm tall is placed on the principal axis of a concave mirror of focal length 9 cm at a distance of 12 cm from it. What is the nature and size of the image ?

29) A convergent beam of light coverages to a point 20 cm behind the convex mirror on the principal axis. An inverted image of the same size is formed coincident with the virtual object. Then, the focal length of the convex mirror is

30) A convex mirror has a focal length 20 cm. A convergent beam of light converges to a point 20 cm behind the convex mirror on the principal axis. The image is formed at

31) The field of view is maximum for

32) An object is placed at a distance of 25 cm from the pole of a convex mirror and a plane mirror is set so that the virtual images formed by two mirrors do not have any parallax. The plane mirror is 20 cm form the object,. The focal length of the mirror is

33) A convex mirror of radius of curvature 1.6 m has an object placed at a distance of 1 m from it. The image is formed at a distance of

34) A spherical mirror forms a real image of a point object placed in front. The distance of the image and object from the mirror is 30 cm and 0.2 m respectively. The focal length and nature of the mirror are

35) An object 5 cm tall is placed 1 m from a concave spherical mirror which has a radius of curvature of 20 cm. The size of the image is

36) A concave mirror is used to form an image of the sun on a white screen. If the lower half of the mirror were covered with an opaque card, the effect on the image on he screen would be

37) The image of an object placed on the principal axis of a concave mirror of focal length 12 cm is formed at a point which is 20 cm more distant from the mirror than the object. The magnifications of the image is

38) Statement 1 : In a convex mrror images produced are always virtual.
Statement 2 : For a convex mirror, focal length is positive.

39) Statement 1 : A concave mirror can be used as a rearview mirror.
Statement 2 : If object is close, image by a concave mirror is virtual

40) At what distance from the mirror should be a screen be placed in order to receive a sharp image ?

41) The size of the image is

42) The nature of the image is

43) Statement 1 : A dentist uses a concave mirror to examine a small cavity.
Statement 2 : A concave mirror always forms a magnified and erect image.

44) Statement 1 : Light from an object falls on a concave mirror forming a real image of the object. If both the object and mirror are immersed in water. There is no change in the position of the image.
Statement 2 : The formation of image by reflection does not depend on surrounding medium, there is no change in position of image provided it is also formed in water.

45) The length of the image along the axis is

46) Magnification along the axis is

47) The height of the image is

48) A diminished virtual image can be formed only in

49) Which of the following could not produce a virtual image

50) An object 5 m tall is placed 1 m from a concave spherical mirror which has a radius of curvature of 20 cm. The size of the image is

51) The focal length of a concave mirror is 50 cm. Where an object be placed so that its image is two times and inverted

52) An object of size 7.5 cm is placed in front of a convex mirror of radius of curvature 25 cm at a distance of 40 cm. The size of the image should be

53) Image formed by a convex mirror is

54) A convex mirror is used to form the image of an object. Then which of the following statements is wrong

55) Given a point source of light, which of the following can produce a parallel beam of light

56) The image formed by a convex mirror of focal length 30 cm is a quarter of the size of the object. The distance of the object from the mirror is

57) A person sees his virtual image by holding a mirror very close to the face. When he moves the mirror away from his face, the image becomes inverted. What type of mirror he is using

58) Which one of the following statements is true

59) While using an electric bulb, the reflection for street lighting should be from

60) A concave mirror is used to focus the image of a flower on a nearby well 120 cm from the flower. If a lateral magnification of 16 is desired, the distance of the flower from the mirror should be

61) A virtual image larger than the object can be obtained by

62) An object is placed 40 cm from a concave mirror of focal length 20 cm. The image formed is

63) A virtual image three times the size of the object is obtained with a concave mirror of radius of curvature 36 cm. The distance of the object from the mirror is

64) Radius of curvature of concave mirror is 40 cm and the size of image is twice as that of object, then the object distance is

65) All of the following statements are correct except

66) If an object is placed 10 cm infront of a concave mirror of focal length 20 cm the image will be

67) Which of the following form(s) a virtual and erect image for all positions of the object

68) An object 1 cm tall is placed 4 cm infront of a mirror. In order to produce an upright image of 3 cm height one needs a

69) A concave mirror gives an image three times as large as the object placed at a distance of 20 cm from it. For the image to be real, the focal length should be

70) The minimum distance between the object and its real image for concave mirror is

71) An object is placed at 20 cm from a convex mirror of focal length 10 cm. The image formed by the mirror is

72) A point object is placed at a distance of 10 cm and its real image is formed at a distance of 20 cm from a concave mirror. If the object is moved by 0.1 cm towards the mirror, the image will shift by about

73) Under which of the following conditions will a convex mirror of focal length f produce an image that is erect, diminished and virtual

74) The focal length of a convex mirror is 20 cm its radius of curvature will be

75) A concave mirror of focal length 15 cm forms an image having twice the linear dimensions of the object. The position of the object when the image is virtual will be

76) A point object is placed at a distance of 30 cm from a convex mirror of focal length 30cm. The image will form at

77) An object 2.5 cm high is placed at a distance of 10 cm from a concave mirror of radius of curvature 30 cm The size of the image is

78) For a real object, which of the following can produced a real image

79) Convergence of concave mirror can be decreased by dipping in

80) What will be the height of image when an object of 2 mm is placed on the axis of a convex mirror at a distance 20 cm of radius of curvature 40 cm

81) Image formed by a concave mirror of focal length 6 cm, is 3 times of the object, then the distance of object from mirror is