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  4. A convex lens made of material of refractive index n1 is placed inside two liquids of refractive indices n2 and n3 as shown . (n2 > n1 > n3). Parallel beam of light is incident on it. The lens will give rise to

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Q. A convex lens made of material of refractive index $n_1$ is placed inside two liquids of refractive indices $n_2$ and $n_3$ as shown . $(n_2 > n_1 > n_3)$. Parallel beam of light is incident on it. The lens will give rise toPhysics Question Image

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Solution:

As $n_2 > n_1$, upper part of lens behaves as a divergent lens. So, parallel beam diverges through this part.
As $n_1 > n_3$, lower part of convex lens remains as a converging lens. So, parallel beam converges at a point through this part.