A point object placed mid-way between two plane mirrors distance 'a' apart. The plane mirror forms an infinite of image due to multiple reflection. The distance between the nth order image formed in the two mirrors is
A
na
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B
2na
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C
na2
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D
3 na
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Solution
The correct option is B 2na From above figure it can be proved that separation between nth order image formed in the two mirrors =2na