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The color spectrum is based on the fact that humans only have three rods/ cones that recognize red, blue, and green.
Thus, this spectrum of color is broken down into these three bands.

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Waves bend when crossing into a new medium since the speed it is travelling changes.
When waves refract, the angle of refraction is ALWAYS greater than the angle of incidence.

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Light reflects from a shiny surface in one direction so the angle of reflection equals the angle of incidence

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The angle between the normal line and the reflected light ray

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The angle between the incoming ray of light and "normal" angle

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Reflection off of a shiny surface behaves differently than light reflected off a more matte surface like a white card.

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A shadow is formed when an object blocks the path of light.
The closer the blocker is the greater of a shadow it casts since the angle of the light ray is increased.

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More often than not, when a source emits a light ray, it emits multiple light rays.
These light rays create multiple dots of light and can combine to create a bigger dot or multiple dots.

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Light rays reflect off of a surface when the new medium isn't able to absorb the ray or permit passage through it.

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Unlike mechanical waves, light rays always travel in straight lines.

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Light is a wave.
However, it is an electromagnetic wave that can travel through a vacuum and air; unlike it's mechanical counterpart.