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  4. A bulb is placed between two plane mirrors inclined at an angle of 60°. The number of images formed is

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Q. A bulb is placed between two plane mirrors inclined at an angle of $60^{\circ}$. The number of images formed is

AMUAMU 2007

Solution:

$ n=\frac{360^{\circ}}{\theta }-1 $
Given, $ \theta =60^{\circ} $
$ \Rightarrow $ $ n=\frac{360^{\circ}}{60^{\circ}}-1 $
$ \Rightarrow $ $ n=6-1\,=5 $