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A biconvex lens is formed by using a piece of plastic (n = 1.70). the radius of the front surface is 20 cm and the radius of the back surface is 30 cm. what is the focal length of the lens?



Answer :

okpalawalter8

The focal length of the lens is mathematically given as

f = 17.15

what is the focal length of the lens?

Generally the equation for focal length is mathematiically given as

1/f = (n-1)(1/R1 -1/R2)

therefore,

1/f = (1.70-1)(1/20 -1/-30)

1/f = 0.70 * 0.083

1/f = 0.0581

f = 17.15

In conclusion, the focal length of the lens

f = 17.15

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