Light enters from air to glass having a refractive index of 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 x 108 m/s.

Speed of Light in Vacuum

Units of speed include:

• the SI derived unit; metres per second (symbol m s−1 or m/s),
• knots (nautical miles per hour, symbol kn or kt);
• kilometers per hour (symbol km/h);
• Mach number (dimensionless), speed divided by the speed of sound;
• miles per hour (symbol mi/h or mph);
• in natural units (dimensionless), speed is divided by the speed of light in a vacuum
• feet per second (symbol fps or ft/s);

Therefore, the speed of light in the glass is 2 x 108 m/s

Summary:

Light enters from air to glass having a refractive index of 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 x 108 m/s.

Light enters from air to glass having a refractive index of 1.50. The speed of light in the glass is 2 x 108 m/s. The speed of light in a vacuum is 3 x 108 m/s. The refractive index of a medium is how the light travels via that medium.