How Does the Speed of Light Traveling Through a Medium

question 79

Multiple Choice

How does the speed of light traveling through a medium (such as air or glass) compare to the speed of light in a vacuum?

• A) It is the same as the speed of light in a vacuum.
• B) It is always less than the speed of light in a vacuum.
• C) It is always greater than the speed of light in a vacuum.
• D) Sometimes it is greater than the speed of light in a vacuum and sometimes it is less, depending on the medium.
• E) Light can't travel through a medium; it only can go through a vacuum.

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