Light with a wavelength of 0.60 microns is normally incident on the surface of the glass disk with a refractive index n = 1,5. Determine if a minimum thickness d of the disc the light intensity at the point for which the drive covers half of the Fresnel zone will be minimal.

Detailed solution shorthand terms, formulas, laws used in the decision, the withdrawal of the calculation formula and the response.
If you have any questions to address, please. I'll try to help.