When a liquid is introduced into the air space between the lens and the plate in a Newton’s ring apparatus, the diameter of the 10th dark ring changes from 1.5 cm to 1.31 cm. Find the index of refraction of the liquid. State your answer to the nearest thousandth of a unit

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When a liquid is introduced into the air space between the lens and the plate in a Newton’s ring apparatus, the diameter of the 10th dark ring changes from 1.5 cm to 1.31 cm. Find the index of refraction of the liquid. State your answer to the nearest thousandth of a unit
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