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  4. The width of man's face is 10 cm. The distance between the eyes of the man is 4 cm. Then the minimum width of plane mirror to see his full face, is

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Q. The width of man's face is $10\, cm$. The distance between the eyes of the man is $4 \,cm$. Then the minimum width of plane mirror to see his full face, is

Ray Optics and Optical Instruments

Solution:

Min. width of plane mirror to see full face
$=\frac{D-d}{2}=\frac{10-4}{2}=3\, cm$