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The radii of curvatur of the faces of a ...

The radii of curvatur of the faces of a double convex lens are 10cm and 15 cm. If focal length of the lens is 12 cm, find the refractive index of the material of the lens.

Text Solution

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`(1)/( f) = ( mu -1) ((1 )/( R_(1) ) - ( 1)/( R_(2)))`
`(1)/( 12) = ( mu - 1) ((1)/( 10) - ( 1)/( - 15))`
`rArr mu = 1.5 `
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