Light of wavelength 6400 Ao is incident normally on a plane parallel glass slab of thickness 5cm and μ=1.6. The beam takes the same time to travel from the source to the incident surface as it takes to travel through the slab. Find the distance of the source from the incident surface. What is the frequency and wavelength of light in glass? c=3×108 m/s.
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for angles of incidence greater than 48.6-degrees, TIR occurs. But 48.6 degrees is the critical angle only for the water-air boundary. The actual value of the critical angle is dependent upon the two materials on either side of the boundary. For the crown glass-air boundary, the critical angle is 41.1 degrees.
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distance of source from incident surface is equals to 8 cm and the wavelength of the light is 4000 angstrom
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