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`        The radii of curvature of the faces of a double convex lens are20 cm and 25 cm. Its focal length is 20 cm. Calculate therefractive index of the material of the lens.`
2 years ago

Arun
23357 Points
```							Dear student 1/f = (n –1) [1/R1 – 1/R2]1/20 = (n –1) [1/20 – 1/-25]1/20 = (n –1) [9/100]9n – 9 = 59n = 14n = 14/9n = 1.555 RegardsArun (askIITians forum expert)
```
2 years ago
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