Question

30. The radii of curvature of the faces of a double convex lens made of glass, are 10
cm and 15 cm. Its focal length is 12 cm. (a) Find the refractive index of glass. (b)
Calculate its new focal length if the lens is completely immersed in water
4
(Refractive index of water is
2+3=5
1 1/2
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Answer 1

Answer:

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Explanation:

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Answer 2

Explanation:

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