The Index of Refraction Is the Ratio of the Speed

question 25

Multiple Choice

The index of refraction is the ratio of the speed of light in that medium to the speed of light in vacuum. If it takes a pulse of 500 nm light 0.15 ns to travel through a 3 cm block of glass, what is the index of refraction of the glass?

• A) 0.0015
• B) 1.5
• C) 10
• D) 30
• E) 500