How Does the Speed of Light in a Substance Such

question 18

Multiple Choice

How does the speed of light in a substance such as glass compare to the speed of light in a vacuum?

• A) The speed of light in glass is faster than the speed of light in a vacuum.
• B) The speed of light is the same in both, equal to 299,792.458 km/s.
• C) The speed of light in glass is slower than the speed of light in a vacuum.
• D) The speed of light in glass can be faster or slower than the speed of light in a vacuum, depending on the type of glass.