Answer :
The ray's angle in relation to the crystal's face is 71.6°. We used the illustration of light moving through water toward the boundary with a less dense medium, like air, to explain TIR.
The refracted ray lies along the border with a 90° angle of refraction when the angle of incidence in water reaches a specific critical value.
Due to that,
Angle of incidence = 27°
We must determine the refraction angle.
Snell's law is used.
Fill out the formula with the value
Using the refraction formula, we must determine the angle of the ray with regard to the crystal's face. Fill out the formula with the value
Hence, the angle of the ray with regard to the crystal's face is 71.6°.
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