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When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index.

1. equal to that of glass
2. less than one
3. greater than that of glass
4. less than that of glass

Correct answer: equal to that of glass

Solution

For the lens to act as a plane sheet of glass, there should be no refraction at its surfaces. This happens when the refractive index of the liquid is equal to that of the glass, as the refractive index difference becomes zero.

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