a convex lens of focal length 40 cm and aconcave lens of focal length 50 cm are placed in contact with each other . what is the power of combination and focal length of combination?
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power of convex lens=100/40=5/2=2.5D
power of concave lens=100/50=2D
power of lens combination=2.5+2D=4.5D
hence focal length of lens combination=1/4.5m
power of concave lens=100/50=2D
power of lens combination=2.5+2D=4.5D
hence focal length of lens combination=1/4.5m
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