The power of a biconvex lens is 10 dioptre and the radius of curvature of each surface is 10 cm. Then the refractive index of the material of the lens
The power of a biconvex lens is 10 dioptre and the radius of curvature of each surface is 10 cm. Then the refractive index of the material of the lens is
A. `3/2`
B. `4/3`
C. `9/8`
D. `5/3`
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Correct Answer - A
(a) Power of a biconvex lens is 10 D.
Radius of curvature of each surface = 10 cm.
`rArr1/R_(f)=(mu-1)[1/R_(1)-1/R_(2)] `
`rArr10=(mu-1)[100/10-(-100/10)]`
`rArr10=(mu-1)[20]`
`rArr(mu-1)=1/2`
`rArr` Refractive index of the material, `mu=3/2`
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