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A beam of light converges to a point P. ...

A beam of light converges to a point P. A lens is placed is the path of convergent beam 12cm from the point P. At what point the beam converges if the lens is
a concave lens of focal length 16cm
a convex length of focal length 20cm

Text Solution

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Here u=12cm f=-16cm the lens equation we have
V=uf/u+f=12`xx-16-:12-16=48` cm as v is positive the beam converges on the same side that of point P
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