Class 12 Physics NCERT solution Ray Optics | Ex -9.8 chapter 9 NCERT solution by Ombir Jindher

A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12cm from P. At what point does the beam converge if the lens is (a) a convex lens of focal length 20cm, and (b) a concave lens of focal length 16cm?

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