The Speed of Light in a Material Is $0.41 \mathrm { c }$

question 33

Multiple Choice

The speed of light in a material is $0.41 \mathrm { c }$ What is the critical angle of a light ray at the interface between the material and a vacuum?

• A) 24°
• B) 17°
• C) 19°
• D) 22°

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