When light of a wavelength λ = 450 nm is incident on a diffraction grating the first maximum after the center one is found to occur at an angle of θ1 = 6.5 degrees. a) Write an expression for the grating's line density, n, in terms of the given quantities.  b) Calculate this spacing in lines per centimeter?  c) Find the angle of the second order intensity maximum, θ2, in degrees.

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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.