First slide

Plane mirror

Question

Two plane mirrors are inclined at an angle of 72°. The number of images of a point object placed between them will be

Moderate

A

2
B

3
C

4
D

5

Solution

$n = (\frac{360}{θ} - 1) \Rightarrow i f \frac{360}{θ} i s e v e n a s \frac{360}{θ} i s o d d, n = (\frac{360}{72}) = 5$

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