First slide

Ray optics

Question

Two plane mirrors are at 45^o to each other. If an object is placed between them, then the number of images will be

Easy

A

5
B

9
C

7
D

8

Solution

$n = \frac{360}{θ} - 1; [\frac{360}{θ} is integer] = 8 - 1 = 7$

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