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Light with wavelength λair = 480 nm traveling through the air is incident on the left...

Light with wavelength λair = 480 nm traveling through the air is incident on the left face of a block of glass (nglass = 1.45) at an angle θ1. It is observed to travel through the glass at angle θ2 = 20°.

1)What is the wavelength of the light when it travels through the glass?

2)What is θ1, the angle of the incident light beam?

3)What is the maximum index of refraction the plastic can have if we want the beam to undergo total internal reflection at the glass plastic interface as shown in the figure?

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