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Q.

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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a

Minimum length of the mirror = 85 cm          

b

Bottom of the mirror should be at a height 80 cm

c

Bottom of the mirror should be at a height 85 cm

        

d

Minimum length of mirror = 80 cm    

answer is B, C.

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Detailed Solution

Question Image

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

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

BG=80 cm

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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, then