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The radius curvature of each surface of ...

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

A

`2.5 D`

B

`2 D`

C

`1.5 D`

D

`1 D`

Text Solution

Verified by Experts

The correct Answer is:
A
Power, ` P=(1)/(f) =(mu-1)[(1)/(R_(1))-(1)/(R_(2))]`
Here, ` mu= 1.5, R_(1)= 40 cm, R_(2)= -0.4 m `
`P=(1.5-1)((1)/(0.4)+ (1)/(0.4))=2.5 D`
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