Light reflection and refraction Worksheet-29

Light reflection and refraction Worksheet-29

71. In an experiment, it was found that when an object is placed at a distance of 25 cm from the mirror it produces an inverted image of the same size as of the object. The focal length of this spherical mirror is

A. 25 cm            B. 1.25 cm         C. 0.125 m         D. 12.5 m 

72. To get an image larger than the object, one can use

A. Convex mirror but not a concave mirror

B. Concave mirror but not a convex mirror

C. Either a convex mirror or a concave mirror

D. Plane mirror

73. An object is placed at a centre of curvature of concave mirror. The distance between its image and the pole is

A. Equal to f                                   B. between f and 2f

C. equal to 2f                                 D. greater then 2f

74. A thin lens and spherical mirror always forms virtual image of the object, then

A. Both are convex

B. Lens concave and mirror is convex

C. Lens is convex and mirror is concave

D. both are concave

75. A ray of light is passing from diamond to glass, which of the following shown the path of ray of light

A.

B.

C.

D.

76. The nature of image is not affected by the position of the object in

A. Plane mirror

B. Concave mirror

C. Convex mirror

D. Both plane and convex mirror

77. A student obtains a blurred image of an object on a screen by using a concave mirror. In order to obtain a sharp image on the screen, he will have to shift the mirror

A. towards the screen

B. away from the screen

C. either towards or away from the screen depending upon the position of the object

D. to a position very far away from the screen

78. The image of a distant object is obtained on a screen by using a concave mirror. The focal length of the mirror can be determined by measuring the distance between

A. the object and the mirror

B. the object and the screen

C. the mirror and the screen

D. the mirror and the screen as well as that between the object and the screen

79. The focal length of the concave mirror in the experimental set up, shown below, equals

A. 10.3 cm         B. 11.0 cm                   C. 11.7 cm          D. 12.2 cm

80. The focal length of the concave mirror in the experimental set up shown below, is:

A. 10.2 cm         B. 11.0 cm                   C. 11.4 cm                   D. 12.2 cm

Answer Key:

71. D
72. B
73. C
74. B
75. A
76. C
77. A
78. C
79. B
80. B