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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

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Solution:

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