A microscope is focussed on a dot on the bottom of the beaker. Some oil is poured into the beaker to a height of `y cm` and it found necessary to raise the microscope through a vertical distance of `x cm` to bring the dot again into focus. Express refractive index of oil in terms of `x and y`.
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A mark at the bottom of a bekar is focussed by a microscope .When water is poured in the beaker up to a height of 16 cm,the microscope has to be raised through a distance of 4 cm in order to bring the mark to focus again .Calculate the refractive index of water.
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A mark is made on the bottom of beaker and a microscope is focussed on it. The microscope is raised through 1.5 cm . To what height water must be poured into the beaker to bring the mark again into focus ? Given that mu for water is 4//3 .
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