What direction does the light go from air into glass ?, light bent towards the normal , What direction does the light go from glass into air?, light bent away from the normal, What direction does the light go from along the normal? , light stay along the normal, What change of speed does the light go from air to glass?, light slows down, What change of speed does the light go glass to air?, light speeds up, What change of speed does the light go along the normal?, light stays the same , Which medium does light travel the quickest through?, Air, Which medium does light travel the slowest through?, solid.

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