A light source emits visible light of two wavelengths: λ = 430 nm and λ' = 510 nm. The source is used in a double-slit interference experiment in which L = 1.50 m and d = 0.025 0 mm. Find the separation distance between the third-order bright fringes for the two wavelengths.

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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.