A convergent lens has a focal length of 20 cm and is made of a material of refractive index 1.1 is immersed in water. The lens will behave as a: 1. Converging lens of f=20 cm 2. Converging lens of f 3. Converging lens of f20 cm 4. Divergent lens(Correct answer) Pls answer in a basic manner Thanks in advance

Question

A convergent lens has a focal length of 20 cm and is made of a material of refractive index 1.1 is immersed in water. The lens will behave as a: 1. Converging lens of f=20 cm 2. Converging lens of f 3. Converging lens of f>20 cm 4. Divergent lens(Correct answer) Pls answer in a basic manner Thanks in advance

Dj Rex 10 · Answer

The lens will act as a diverging lens. Since the refractive index of lens is lesses than that of water. So ray entering water from the lens will diverge away from the normal.

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