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

question 55

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

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