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opjectispracedvelyciusetotheotc theA man is 180 em tall and his eyes are 10 cm below the top of his head. In order to see his entire height right from toe to head, huses a plane mirror kept at a distance of 1 m from him. The minimum length of the plane mirror required is(a) 180 cnm(c) 85 em(d) 17o em |
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Answer» We can see in the figure if U draw:HF = height of the man = 180 cmE = Eye of human i.e. HE = 10 cmHere it can easily be noticed that AE=AH=POBE=OQ=BFDue to reflection, we need the mirror of the length i.e. PQ i.e. HF/2 = 90cm |
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