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A plane mirror M and a concave mirror X ...

A plane mirror M and a concave mirror X are kept at a seperation of 40cm with their reflecting faces facing each other as shown in figure. An object AB is kept perpendicular to the principal axis in position (1). Considering successive reflections first at mirror X and then at M a real image is formed infront of M at a normal distance 8 cm form it. If the object is mived to new position (2), the real image is formed atg 20cm from M with the reflections as described earlier.

Focal length of mirror X is

A

11cm

B

12cm

C

14cm

D

15cm

Text Solution

Verified by Experts

The correct Answer is:
D
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