The speed of light through air is approximately 3 x 108 m/s., The speed of light through glass is approximately 2 x 108 m/s., When the light ray passes through glass, its speed decreases., This causes the light ray to bend., The angle of incidence is greater than the angle of refraction., When the light passes back into the air, its speed increases., The angle of refraction is greater than the angle of incidence..

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