Light with a wavelength of 750nm shines normally on a double slit. The fourth order (m=4) bright fringe is observed at an angle of 1.5 degrees. What is the distance between the slits? At what angle will the first order (m = 1) bright fringe be observed?

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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.