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Q.

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 

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a

 12 cm 

b

36 cm

c

48 cm 

d

24 cm

answer is D.

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Detailed Solution

By using lens formula

116=1v1(+12)1v=112116=4348v=48cm

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