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What is the refractive index of material...

What is the refractive index of material of a plano-convex lens, if the radius of curvature of the convex surface is 10 cm and focal length of the lens is 30 cm ?

Text Solution

Verified by Experts

According to lens-maker’s formula
`1/f=(mu-1)(1/R_(1) - 1/R_(2))`
Here f=30cm, `R_(1)`=10cm and `R_(2)=oo`
so, `1/30=(mu-1)(1/10 - 1/oo)`
`mu=(4//3)`
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