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A thick sheet of transparent plastic sits on top of the horizontal surface of a block...

A thick sheet of transparent plastic sits on top of the horizontal surface of a block of glass. For a ray traveling in the glass, the critical angle at the glass-plastic interface is 48.6∘∘ and the wavelength of the light in the glass is 510 nm.

a.

For an incident angle of 45.0 in the glass, what is the wavelength of the light after it refracts into the plastic?

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Answer #1

At the angle of incidence equal to critical angle, the angle of refraction will be 90° . use this to find the relation between refractive indices of the two materials using Snell’s law. Use that to find the required wavelength as shown below

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