what is the power of a convex lens of a focal lenght 5 cm
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Answer: P=1/f where P is optical power in dioptries and f is focal length in meters. 5 cm is 0,05 m, so 1/0,05 is 20. The power of the lens is 20 dioptries
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focal length=5C.M
power of convex lens(D)=100/f (in c.m)
D=100//5
D=20
20 Diptroes in C.M
0.05 Diptroes in M
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