In Young's interference experiment, a monochromatic beam of light with 1 = 500 nm passes through identical slits whose slits are 1 mm apart and each slit has a width w. If on a screen 2 m from the slit it is observed that the 4th-order main maximum interference is lost, then (a) determine the width of the slit w, and (b) determine the width of the diffraction principal envelope.

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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.