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Question

Two plane mirrors at an angle (xo) produces 5 images of a point. The number of images produced when x0 is decreased to (xāˆ’30)o is

A
9
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B
10
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C
11
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D
12
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Solution

The correct option is C 11
when aplan mirror's are inclined at an angle x0 for number of images we use formula -
360x01= number of images
apblying it here 360x01=5360x0=6
x=00––––––– by doing x030 ie 6030
=30
no. of images 360301=nn=11
Hence obtion 'c' is correct.

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