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Question

A beam of light converges to a point P. A concave lens of focal length 16 cm is placed in the path of the convergent beam 12 cm from P. How far from the lens does the beam converge?


A
12 cm
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B
7.5 cm
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C
36 cm
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D
48 cm
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Solution

The correct option is D 48 cm


Lens formula is given by
1v1u=1f
v=fuf+u
Here, the rays are initially about to converge at point P. Hence P acts as the virtual object for concave lens.
u=+12 cm and f=16 cm
Hence, f=(16)(12)16+12
=4×12=48 cm

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