Question

A point object is placed at a distance of 25 cm on the axis of a convex lens of focal length 20 cm .On the other side of the lens, a convex mirror is placed at a distance of 50 cm from the lens such that the image formed by the combination coincides with the object itself . The focal length of the convex mirror is

A

10 cm

B

15 cm

C

20 cm

D

25 cm

Medium
Solution
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Correct option is D)



(@ centre of curvature)



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