Parameters of a Dielectric Waveguide. Light of free-space wavelength X, = 0.87 um isguided by a thin planar film of width d = 2 μm and refractive index n₁ = 1.6 surrounded bya medium of refractive index n₂ = 1.4.(a) Determine the critical angle 0, and its complement c, the numerical aperture NA, andthe maximum acceptance angle for light originating in air (n = 1).(b) Determine the number of TE modes.(c) Determine the bounce angle and the group velocity v of the m= 0 TE mode.

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