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Question

Two plane mirrors are parallel to each other and an object O is placed between them. The distance (in cm) of the first three images from the mirror M2 after reflection from the mirror M2 will be



A
5,10,15
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B
5,15,30
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C
5,25,35
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D
5,15,25
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Solution

The correct option is C 5,25,35

The object is at a distance of 5 cm from M2, thus first image will form at 5 cm from M2. Also, object is at a distance of 10 cm from M1, so image (A) formed by it will be at 10 cm from it. This image (A) will act as object for M2 and second image will be form at 25 cm from M2. Similarly, the first image of object in M2 will act as object for M1. Its image (B) in M1 will form at 20 cm from it. This will again act as object for mirror M2 and third image will form at 35 cm from it.

Alternative:

The first three images will be at a distance 5 cm25 cm and 35 cm from mirror M2

Physics

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