First slide

Ray optics

Question

A person standing in the centre of a room, 12 m high looks into a plane mirror fixed on the wall. Then the minimum length of the plane mirror for him to see the full length image of the wall behind him, is equal to

Moderate

A

12 m
B

8 m
C

4 m
D

6 m

Solution

Height of mirror = $\frac{h}{3} = \frac{12}{3} = 4 cm$

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