Monochromatic light of wavelength 500nm in air is incident along a normal line to a plane of glass (n-1.5) that has 150nm thick transparent coating, with an index of refraction somewhere between 2.5 and 2.9. This light is brightly reflected (completely constructive interference.) What is the index of refraction of the coating? The mediums are air (n=1) -> coating (n=?) -> glass (=1.5) The screenshot has the full question/answer options.

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Diffraction of light

In physics, the term diffraction is defined as the bending of light around the corners of the obstacle. As a light ray passes by an aperture, it bends around the edges or through slits, it spreads out through a narrow opening. The diffracted light will produce fringes of bright and dark or colored bands which are labeled as a diffraction pattern.