1.

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=20cm, f=20cm from the lens equation we have

Answer»

SOLUTION :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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