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Question

An object is placed at 60 m in front of a concave mirror. If its radius of curvature is 40 m, find the position of image.


A

20

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B

30

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C

60

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D

120

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Solution

The correct option is B

30


For the given problem,
Sign conventions for u = -ve ( Left side of the mirror)
f = -ve ( Concave mirror)

Using mirror formula,
1v + 1u = 1f
1v + 160 = 120
1v = 1360
v=30m
(Negative sign represents that object and image are on the same side of mirror.)


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