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A man of height 2h stands in the middle of a room of length 6h. The height of the wall is 4h. What is the minimum length of a plane mirror to be placed on the wall in front of the man so that he can see the entire wall behind him

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\frac{4h}{3}

answer is D.

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Detailed Solution

When a person is exacts middle of the room if he wants to see full image of the wall of height ‘h’ then minimum length of mirror required to

h/3

Here h is given 4 h, required length $\frac{4h}{3}$

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