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13. The speed of light in a material is calculated by dividing the speed of light in a vacuum by the index of refraction in the material.

Calculate the speed of light in water which has a refraction rate of 1.33. Showing your work is not necessary.

14. The speed of light in a material is calculated by dividing the speed of light in a vacuum by the index of refraction in the material.

Calculate the speed of light in glass which has a refraction rate of 1.50

Showing your work is not necessary.