93. The observer counts the width of 10 Newton rings away from its center. It is equal to 0.7 mm. The width of these rings 10 is equal to 0.4 mm. Observation is made of the reflected light at a wavelength of 589 nm. Define the radius of curvature of the lens surface.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)