Light Enters a Plane-Parallel Block of Glass from the Vacuum

question 218

Multiple Choice

Light enters a plane-parallel block of glass from the vacuum of space and leaves again into space through the opposite side (e.g.,in a space-borne instrument) .What is the speed of light after it leaves the glass?

• A) It is the same speed it was before it entered the glass.
• B) The exit speed will depend on the thickness of the glass, becoming slower the thicker the glass.
• C) It is faster than when it entered because it has passed through the dense glass.
• D) It is slower because it has passed through the glass and been slowed by it.

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