NEET Physics (general) MCQ Question
What is the condition for a lens to make an object appear to disappear in a liquid?
The refractive index of the liquid must equal the lens's refractive index.
The liquid must have a higher refractive index than the lens.
The liquid must be a gas to make the lens disappear.
The lens must be placed at its focal point in the liquid.
Correct Answer
Detailed Explanation
The refractive index of the liquid must be equal to that of the lens to make it appear to disappear, as indicated in the example about the magician and the glass lens with n = 1.47.
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