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The radius of curvature of each surfac...

The radius of curvature of each surface of a convex lens of refractive index 1.5 is 40 cm. Calculate its power.

Text Solution

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Here, `n = 1.5 , R_(1) = + 40 cm = 0.04 m`
`R_(2) = - 40 cm = - 0.04 m`
power (p) = `(1)/(f) = (n-1) ((1)/(R_(1)) - (1)/(R_(1)))`
`=(1.5-1)[(1)/(0.04)-(1)/((-0.04))]=0.5xx(2)/(0.04)`
P = 2.5 D
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