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A point object is placed on the axis of the concave mirror at a distance of 60 cm from the focal point of the mirror. Its image is formed at the point of object then focal length of the mirror is

A

15 cm

B

30 cm

C

60 cm

D

120 cm

Text Solution

Verified by Experts

The correct Answer is:
C
u = - (60 + f ) and v = - (60 + f)
Image coincide with object at centre of curvature
i.e. - (60 + f) = 2f `rArr ` f = 60 cm.
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