If light enters from air into glass with refractive index 1.50, and the speed of light in vacuum/air is 3x10^8 m/s, what is the speed of light in the glass?
Question
If light enters from air into glass with refractive index 1.50, and the speed of light in vacuum/air is 3x10^8 m/s, what is the speed of light in the glass?
4.5 x 10^8 m/s
3 x 10^8 m/s
2 x 10^8 m/s
1.5 x 10^8 m/s
Answer
2 x 10^8 m/s
Detailed Explanation
Using n = c/v, v = c/n = (3x10^8)/1.50 = 2x10^8 m/s.