Light of wavelength 929 nm is incident on the face of a silica prism (the prism

Question

Light of wavelength 929 nm is incident on the face of a silica prism (the prism is long and extended perpendicular to the plane of the ?gure) at an angle incidence of ?1 = 74.9 degrees. The apex angle of the prism is ? = 66.6 Given: The value of the index of refraction for silica is n = 1.455.
I have found the angle of refraction at the first surface to be 41.5 degrees and I have also found the
angle of incidence at the second surface to be 25.1 degrees. How can I find the angle of refraction at the second surface?

Explanation / Answer

is it 64.9?

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