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SB,19) a man ...

Question

SB,19) a man uses a concave mirror for shaving . He keeps his face at a distance of 25 cm from the mirror and gets an image which is 1.4 time enlarged.Find the focal length of the mirror.

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Solution

ocal length, f= ?
Object distance, u=-25 cm
Magnification, 1.4=-v/ -25
v= 35 cm
Using the mirror formula,
1/v + 1/u=1/f
1/35-1/25 =1/f
f = - 62.5 cm

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