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Question

A cube of side 2 m is placed in front of a concave mirror focal length 1m with its face P at a distance of 3 m and face Q at a distance of 5 m from the mirror. The distance between the images of face P and Q and height of images of P and Q are

A
1 m, 0.5 m, 0.25 m
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B
0.5 m, 1 m, 0.25 m
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C
0.5 m, 0.25 m, 1m
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D
0.25 m, 1m, 0.5 m
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Solution

The correct option is D 0.25 m, 1m, 0.5 m

For surface P,1v1=1f1u=113=23v1=32m
For surface Q,1v2=1f1u=115=45v2=54m
v1v2 = 0.25 cm

Magnification of P=v1u=3/23=12

Height of P=12×2=1m

Magnification of Q=v2u=545=14

Height of Q=14×2=0.5m


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