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What si the number of images of a point ...

What si the number of images of a point object held inbetween two plane mirrors inclined at an angle `theta^(@)` ?

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Number of images , `n = ((360^(@))/(theta) - 1)`, if `(360)/(theta)` is even integer and `n = (360)/(theta)`, if `(360)/(theta)` is odd integer.
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