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A man of height 170 cm wants to see his complete image in a plane mirror (while standing). His eyes are at a height of 160 cm from the ground.

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Minimum length of the mirror = 80 cm

Minimum length of the mirror = 85 cm

Bottom of the mirror should be at a height 80 cm

Bottom of the mirror should be at a height 85 cm

answer is C.

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Detailed Solution

Given Height of man H = 170 cm

Height of eye from ground = 160 cm

The minimum length of mirror required to see his full image is (h) = $\frac{H}{2} = \frac{170}{2} = 85 cm$

Question Image

From diagram $h = 80 + 5 = 85 cm$

Lower end of mirror at a heigh of 80 cm from the ground

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