The figure shows two parallel plane mirrors. Object ′O′ is placed 7cm from mirror M1. Then, the distance of the final image from the mirror M1 is
A
7cm
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B
3cm
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C
13cm
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D
10cm
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Solution
The correct option is A7cm Since M1 is a mirror, it will only allow reflection to take place and no light will be transmitted beyond the mirror M1 towards the second mirror M2.
Hence, virtual image formed by M1 is at the same distance from the mirror as the distance between the object and the mirror.