Light: reflection and refraction

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14 Terms

1
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incident ray

the ray that comes from an object and strikes a surface.

2
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reflected ray

the light ray that bounces off a surface

3
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angle of incidence

the angle between the incident ray and the normal

<p>the angle between the incident ray and the normal</p>
4
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angle of reflection

The angle between the reflected ray and the normal

<p>The angle between the reflected ray and the normal</p>
5
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normal

A line drawn at 90° to a surface, at the point of incidence

<p>A line drawn at 90° to a surface, at the point of incidence</p>
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reflection

The bouncing back of a wave when it hits a surface through which it cannot pass.

7
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plane mirror

a mirror with a flat surface

8
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image

a copy of an object formed by reflected or refracted rays of light

9
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image in a plane mirror

same size

same way up

back to front

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refraction

a wave changing direction as it passes from one material to another

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refraction diagram: less dense to more dense

light ray bends towards the normal

<p>light ray bends towards the normal</p>
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refraction diagram: more dense to less dense

light ray bends away from the normal

<p>light ray bends away from the normal</p>
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dispersion

white light separates into colours due to refraction through a prism

<p>white light separates into colours due to refraction through a prism</p>
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prism

a glass block, usually triangular, that causes dispersion by diffraction