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Q. When the glancing angle of incidence of light on a material is 30$^\circ$, the reflected and refracted light are found to be perpendicular. The refractive index of material is

COMEDKCOMEDK 2004Wave Optics

Solution:

n = tan $z_p \,=\, tan (90^{\circ} \,-\, 30^{\circ}) \,=\, tan 60^{\circ} \,=\, 1.732$