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A lens, immersed in a liquid becomes invisible when
The focal length of the lens is zero.
The focal length of the lens is infinite.
The refractive index of the lens is less than the refractive index of the liquid.
The refractive index of the lens is equal to refractive index of the liquid.
3rd option is correct. A lens, immersed in a liquid becomes invisible when the refractive index of the lens is less than the refractive index of the liquid.
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