In Newton's ring experiment when oil is introduced into the space between the lens and the plate,the radius of the 9^th ring decreases from 1.9 cm to 1.71 cm.The refractive index of the oil is

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Quizplus · Accepted Answer

The radius of the ring is proportional to the square root of the refractive index. Using the formula for the radius of the rings in Newton's rings experiment, $ R_n \propto \sqrt{n} $, and knowing the initial and final radii, we can set up the equation: $ \frac{1.71}{1.9} = \sqrt{\frac{n_{oil}}{n_{air}}} $. Solving for $ n_{oil} $ gives approximately 1.23.

In Newton's Ring Experiment When Oil Is Introduced into the Space