Question

find the combine focal lenght of concave lens whose f=30cm and focal lenght of convex lens whose f=50cm

Answer 1

focal length of convex len=0.5m
power of the convex lens =1/0.5
=+2D

focal length of concave lens =0.3m
power of concave lens =1/0.3
=10/3
=-3.3D

power of combination =+2-3.3
=-1.3D

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