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As a light beam travels from air to glass, its... a. speed remains constant. b. speed changes. c. frequency changes. d. wavelength remains constant.
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As a light beam travels from air to glass, its... a. speed remains constant. b. speed changes. c. frequency changes. d. wavelength remains constant.

User Kenyakorn Ketsombut
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The answer is A because light does not change speed once it is going in a certain speed
User Dreambold
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