A Ray of Light Traveling in Air Enters the End $\theta$

question 67

Multiple Choice

A ray of light traveling in air enters the end of a rectangular block of a material that has an idex of refraction n = 1.35. The largest value of the angle $\theta$ for which total internal reflection occurs at the upper surface of the material is approximately

• A) 75º
• B) 48º
• C) 56º
• D) 78º
• E) None of these is correct.

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