Q. 8

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 times enlarged. Find the focal length of the mirror.

Answer :

87.5 cm

The distance of the man’s face from the mirror,


u =25cm


The magnification in the image= 1.4



Using the mirror formula




Then, f= -87.5cm


Hence, the focal length of the concave mirror is 87.5cm


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