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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
Here u=12cm, f=20cm from the lens equation we have

Text Solution

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V=uf/u+f=`12xx20-:12+20=240//320=7.5`cm
As v is positive the beam converges on the same side as the of point of P
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