A man is sitting in a room at 2m from a ...

A man is sitting in a room at 2m from a wall `W_1`, wants to see the full height of the wall `W_2` behind him 4m high and 6m away from the facing wall `W_1`. What is the minimum vertical length of mirror on the facing wall required for the purpose?

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The correct Answer is:

Let the min. length of mirror be L
`:. L/4 =2/8 rArr L=1m`

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