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, then

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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

Minimum length of mirror = 80 cm

answer is B, C.

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Detailed Solution

Only min AB length of mirror required to the full image i.e., $80 + 5 = 85 c m$

The mirror should be kept at a height BG from the ground

$∴ B G = 80 c m$

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