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प्रश्न
A microscope is focused on a dot at the bottom of a beaker. Oil is poured into the beaker to a height of y cm. Now, the microscope is to be raised through a vertical distance of x cm to bring the dot again into focus. Express the refractive index of oil in terms of x and y.
समीकरण/सूत्र
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उत्तर
n = `y/(y - x)`
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