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  4. A hollow lens is made of thin glass and in the shape of a double concave lens. It can be filled with air, water of refractive index 1.33 or CS2 of refractive index 1.6. It will act as a diverging lens, if it is

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Q. A hollow lens is made of thin glass and in the shape of a double concave lens. It can be filled with air, water of refractive index $1.33$ or $CS_{2}$ of refractive index $1.6.$ It will act as a diverging lens, if it is

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Solution:

When medium outside a lens is denser than medium of lens, then a concave lens will acts like a convex lens and vice-versa. Now, when hollow lens is filled with $CS_{2} (\eta = 16)$ and immersed in water $(p = 133),$ its nature remains diverging as refractive index of medium of lens is more than refractive index of surrounding medium.