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8 Terms

1
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reflection

the bouncing of waves off an obstacle in their path

2
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refraction

the changing of direction of a wave when it goes from medium to another

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diffraction

the spreading of waves into a region beyond a or around an obstacle

4
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a light ray

a straight line showing the direction in which light is travelling

5
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laws of reflection 1

the angle of incidence equals the angle of reflection

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laws of reflection 2

the incident The reflected ray normal at the point of incidence all lie in the same plain

7
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whats RADET stand for

rarer to denser = toward

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what is Snell's Law

the ratio of the of the angle of incidence to the angle of refraction is a constant