10. Given : Speed of light in glass = 1.91 x 10 8 m/s Speed of light in vacuum = 3.00 x 10 8 m/s = 1.57 The refractive index is 1.57 = 3.00 x 10 8 m/s 1.91 x 10 8 m/s
11. Given : Refractive index in water = 1.33 Speed of light in a vacuum = 3.00 x 10 8 m/s v = 2.26 x 10 8 m/s The speed of light in water is 2.26 x 10 8 m/s 1.33 = 3.00 x 10 8 m/s v