A Ray of Light Is Normally Incident on Face Ab $\alpha$

question 55

Multiple Choice

A ray of light is normally incident on face ab of a plastic prism with an index of refraction n = 1.20 as shown.
-Determine the largest value of the angle $\alpha$ so that the ray is totally reflected at the face ac if the prism is immersed in a liquid with refractive index 1.12.

• A)21°
• B)34°
• C)69°
• D)78°
• E)Total internal reflection will not occur for any value of \(\alpha\).

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