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Q.

A point object is placed mid-way between two plane mirrors distance 'a' apart. The plane mirror forms an infinite number of images due to multiple reflections. The distance between the nth order image formed in the two mirrors is: 

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a

n2a

b

2na

c

na

d

na/2

answer is B.

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Detailed Solution

From above figure it can be proved that seperation between nth order image formed in the two mirrors = 2na

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