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When light ( refracts, reflects ) into a substance in which it must slow down, the light ( beam, ray, column, shaft ) will ( tend to move, bend, twist, lean ) toward a line ( parallel, diagonal, perpendicular, horizontal ) to the surface it ( collides with, hits, strikes ).
When light ( refracts, reflects ) into a ( matter, material, substance ) in which it ( speeds up, slows down ), the ( sound wave, light ray, magnetic field, subject of interest ) will bend away from a line ( perpendicular, parallel ) to the surface it strikes.