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A point source of light along a straight...

A point source of light along a straight road is at a height of 'a' metres. A boy 'b' metres in height is walking along the road. How fast is his shadow increasing if he is walking away from the light at the rate of 'c' metres per minute ?

A

`(bc)/(a-b)"mt/min"`

B

`(bc)/(a+b)"mt/min"`

C

`(bc)/(2(a-b))"mt/min"`

D

`(bc)/(2(a+b))"mt/min"`

Text Solution

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The correct Answer is:
A
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