1.

The focal length of a convex lens is 20 cm. What is its power?

Answer»


SOLUTION :GIVEN: FOCAL length (F)=20 CM =0.2 m
To find: Power of the lens (P)
Formula: `P=(1)/(f(m))`
Calculation: From formula,
`P=(1)/(0.2)`
`=5D`


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