When a Beam of Light, Which Is Traveling in Glass

question 21

Multiple Choice

When a beam of light, which is traveling in glass, strikes an air boundary, there is

• A) a 90° phase change in the reflected beam.
• B) no phase change in the reflected beam.
• C) a 180° phase change in the reflected beam.
• D) a 60° phase change in the reflected beam.
• E) a 45° phase change in the reflected beam.

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