See the attached picture. To give a glass window a red hue, a thin polymer (n = 1.6) coating is applied to the glass (n = 1.4).  What is the minimum thickness of the coating required to produce this effect?  Take the wavelength of red light to be 650 nm and answer with 3 significant digits. The minimum thickness of the coating is how many nanometers (nm)?

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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.