Question

In an experiment a convex lens of focal length is placed coaxially on an optical bench in front of a convex mirror at a distance of from it. It is found that an object and its image coincide, if the object is placed at a distance of from the lens. The focal length of the convex mirror is: 

A

B

C

D

Medium
JEE Mains
Solution
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Correct option is A)

for convex lens:
for mirror:
for the mirror to form image at '0':

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