First slide

Plane mirror

Question

A man is 180 cm tall and his eyes are 10 cm below the top of his head. In order to see his entire height right from toe to head, he uses a plane mirror kept at a distance of 1m from him. The minimum length of the plane mirror required is

Moderate

A

180 cm
B

90 cm
C

85 cm
D

170 cm

Solution

According to the following ray diagram length of mirror $= \frac{1}{2} (10 + 170) = 90 cm$

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