A microscope is focussed on a dot on the bottom of the beaker. Some oil is poured into
Channel: Doubtnut
Date: 2020-08-02

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`.