1.

A source of light is hung h mts. Directly above a straight horizontal path on which a boy a mts. In height is walking. If a boy walks at a rate of b mts/sec. from the light then the rate at which his shadow increasese.

Answer»

`(AB)/(h-a)mt//sec`
`(ab)/(h+a)mt//sec`
`(ab)/(2(h-a))mt//sec`
`(ab)/(2(h+a))mt//sec`

ANSWER :A


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