The solution of the problem 3.30 кр 3 from the problem

The solution of the problem 3.30 кр 3 from the problem

Task 3.30
In the installation for observing Newton´s rings, the space between the lens and the glass plate is filled with liquid. Determine the refractive index of the liquid if the diameter of the second light ring in reflected light is 5 mm. Light with a wavelength of 0.615 m falls normally. The radius of curvature of the lens is 9 m.

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