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JEE Main & Advanced Physics Ray Optics Question Bank Numerical Value Type Questions - Ray Optics and Optical Instruments

  • question_answer
    A coin lies on the bottom of a vessel filled with water to a depth of 40 cm. At what height (in cm) should a small electric lamp be placed above the water surface so that its image produced by the rays reflected from the water surface coincides with the image of the coin formed by the refracted rays?

    Answer:

    30


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