Two parallel slits are illuminated by light composed of two wavelengths. One wavelength is AA = 594nm. The other wavelength is AB and is unknown. On a viewing screen, the light with wavelength AA = 594nm produces its third-order bright fringe at the same place where the light with wavelength AB produces its fourth dark fringe. The fringes are counted relative to the central or zeroth-order bright fringe. What is the unknown wavelength?

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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.