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Reflection

Two plane mir...

Question

Two plane mirrors A and B are parallel to each other and spaced $20 c m$ apart. An object is kept in between them at $15 c m$ from $A$ , Out of the following, at which point image is not formed in mirror A (distance measured from mirror A)

A

15 c m

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B

25 c m

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C

45 c m

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D

55 c m

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Solution

The correct option is C $45 c m$
Image at $15 c m = I_{A}$
Image at $25 c m = I_{B A}$
Image at $55 c m = I_{A B}$
Clearly no image is formed at $45 c m$ from the mirror $A$

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