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A convex lens made up of glass of refractive index 1·5 is dipped, in turn, in (i) a medium · of refractive index 1·65, (ii) a medium of refractive index 1·33. (a) Will it behave as a converging or a diverging lens in the two cases? (b) How will its focal length change in the two media ?

A convex lens made up of glass of refractive index 1·5 is dipped, in turn, in
(i) a medium · of refractive index 1·65,
(ii) a medium of refractive index 1·33.


(a) Will it behave as a converging or a diverging lens in the two cases? (b) How will its focal length change in the two media ?

Grade:11

2 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
3 years ago
576-301_1.PNG
Vikas TU
14149 Points
3 years ago
So fi and fa are of opposite sign. Therefore, convex in liquid 1 behaves as a diverging lens.  Focal length becomes negative and it's magnitude increases.

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