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.

The lens will behave as a converging lens. Since the refractive index of water (1.33) is higher than that of the lens material (1.25), light will bend inward, causing the biconcave lens to act as a converging lens.

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