Question

The refractive index of glass and water with respect to vacuum are 3/2 and 4/3. If the speed of light in glass is 2x108 ms find the speed of light in vacuum, water

Answer 1

Answer:

Actually, ng = 3/2 and nw = 4/3. Absolute Refractive Index of a medium = Speed of light in vacuum/Speed of light in the medium Speed of light in glass = 2 x 108 m/s Speed of Light in Vacuum = (3/2) x 2 x 108 m/s = 3 x 108 m/s Speed of light in water = (3 x 108 m/s)/(4/3) = 2.25 x 108 m/s