A luminous object is placed 20 cm from s...

A luminous object is placed 20 cm from surface of a convex mirror and a plane mirror is set so that virtual images formed in two mirrors coincide. If plane mirror is at a distance of 12cm from object. Then focal length of convex

A

5cm

B

10cm

C

20cm

D

40cm

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The correct Answer is:

A

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