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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 ?

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According to lens - maker's formula
`(1)/(f ) = (mu -1) [ (1)/(R _(1)) - (1)/(R_(2))] ` with `mu= (mu_(L))/(mu_(M))`
Here f=30 cm `R_(1) =10` cm
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