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Image Shift in a Glass Slab

A man 160 cm ...

Question

A man 160 cm high stands in front of a plane mirror. His eyes are at a height of 150 cm from the floor. Then the minimum length of the plane mirror for him to see full length image is :

A

85 cm

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B

170 cm

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C

80 cm

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D

340 cm

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Solution

The correct option is B 80 cm
For getting full image, length of the mirror should be half that of an object(man).

Length of mirror $= 160 / 2 = 80 c m$

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