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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