A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length 12.5 cm in such a way that they have the same principle axis. Find the power of the combination.
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Explanation:
focal of convex lens(f)=+20cm=20/100=+.20 m
P=1/f=1/.20=100/20=+5D
focal length of concave lens(f)=-10cm=-10/100=-.1 m
P=1/-.1=-10D
power of combination=5-10=-5D
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