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20 Physics -- Reflection at Curved Mirror

The curved face of a Plano-convex lens ( Refractive index 1.5)  is placed in contact with a plane mirror. An object at 20 cm distance coincides with the image produced by the lens and the reflection by the mirror. A film of liquid is now placed between the lens and the mirror and the co...

The curved face of a Plano-convex lens ( Refractive index 1.5)  is placed in contact with a plane mirror. An object at 20 cm distance coincides with the image produced by the lens and the reflection by the mirror. A film of liquid is now placed between the lens and the mirror and the coincident object and the image are at 100 cm distance . What is the index of refraction of the liquid?

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