1.

A boy is 1.8 m tall and can see his image in a planemirror fixed on a wall. His eyes are 1.6 m from the floorlevel. The minimum length of the mirror is(a) 0.1 m (b) 0.7 m (c) 0.9 m (d) 0.5 m

Answer»

minimum length=height/2=1.8/2=0.9m



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