It has been experimentally established that a lens made of a transparent material, bounded by two spherical surfaces of radii and r2, is capable of collecting a narrow beam of light emitted by a point source into one point. Using this experimental fact and Fermat's principle, establish a relationship between the focal length of the lens and the refractive index n of the glass and the radii of curvature r1 and r2.
Detailed solution. Format jpg
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