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Figure given below shows a beam of light converging at point P.  When a concave lens of focal length 16 cm is introduced in the path of the beam at a place O shown by dotted line such that OP becomes the axis of the lens, the beam converges at a distance x from the lens. The value x will be equal to 

a
12 cm
b
24 cm
c
36 cm
d
48 cm

detailed solution

Correct option is D

By using lens formula1−16=1v−1(+12)⇒1v=112−116=4−348⇒v=48cm

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