10 3 a Bending light When a ray
10. 3 a Bending light When a ray of light enters a glass block at an angle to the normal, the angle is called its angle of incidence (i). © Oxford University Press 2009
10. 3 a Bending light When the light ray changes direction inside a glass block, its angle to the normal is called its angle of refraction (r). It is smaller than the angle of incidence. © Oxford University Press 2009
10. 3 a Bending light When the light ray leaves a glass block and enters the air, which is less dense, its angle to the normal changes again and becomes bigger. © Oxford University Press 2009
10. 3 a Bending light If you increase the angle of incidence the angle of refraction also increases. © Oxford University Press 2009
10. 3 a Bending light Waves Light is a wave. In diagrams we can represent this more simply as: © Oxford University Press 2009
10. 3 a Bending light Light changes direction when it enters a denser substance at an angle because the part of the wave which hits it first slows down and changes the angle of the whole wave. © Oxford University Press 2009
10. 3 a Bending light Light changes direction when it enters a less dense substance at an angle because the part of the wave which hits it first speeds up and changes the angle of the whole wave. © Oxford University Press 2009
10. 3 a Bending light When light enters a denser substance at right angles all the wave is slowed down at the same time so it does not change direction. © Oxford University Press 2009
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