A biconcave lens made of a transparent material of refractive index 1.25 is immersed in water of refractive index 1.33. Will the lens behave as a converging or a diverging lens? Give reason.

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Solution

Since refractive index of lens w.r.t. water is $\frac{1.25}{1.37}$ which is less than one, hence biconcave lens will behave like converging lens.

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A biconcave lens made of a transparent material of refractive index 1.25 is immersed in water of refractive index 1.33. Will the lens behave as a converging or a diverging lens? Give reason.

Since refractive index of lens w.r.t. water is 1.251.37 which is less than one, hence biconcave lens will behave like converging lens.

Since refractive index of lens w.r.t. water is $\frac{1.25}{1.37}$ which is less than one, hence biconcave lens will behave like converging lens.