A thin film of cryolite (nc = 1.27) is applied to a camera lens (ng = 1.64). The coating is designed to reflect wavelengths at the blue end of the spectrum and transmit wavelengths in the near-infrared. What minimum thickness gives high transmission at A? Answer in units of 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.