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

question 9

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) \(22 ^ { \circ }\)
• B) \(24 ^ { \circ }\)
• C) \(17 ^ { \circ }\)
• D) \(19 ^ { \circ }\)

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