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A light ray is an imaginary line that represents a beam of light. Reflection occurs when light bounces off a surface. Specular reflection is a surface reflection, where each incident ray produces only one reflected ray. Diffuse reflection is a surface reflection, where each incident ray produces many scattered rays. Refraction occurs when light bends while crossing a surface or moving through a material. Index of refraction is a number that measures how much a material is able to bend light.

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Materials that allow light to pass are transparent. When some light can pass through but the light is scattered in many directions. Opaque is when no light at all can pass.

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Lens is an optical device for bending light rays. A Mirror is a surface that reflects light rays. A prism is a glass shape with flat, polished surface that can both bend and reflect light.

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CMYK is the subtractive color process using cyan, magenta, yellow, and black to create reflected light. Which cyan, magenta, and yellow you can make any color, expect for white or black.

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This is what are used to show color on a TV or other screen. What it actually is a lot of red, green, and blue lights. This tricks our mind so we see an image

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Light enter in our retina and photoreceptors interpret the color. We have 3 cone cells for color. One for low energy light, like red ones. One for medium energy light, like green ones. The third one is for high energy light, like blue ones.

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The electromagnetic spectrum is the entire range of electromagnetic waves. The electromagnetic spectrum consists of radio waves, microwaves, infrared lights, visible light, ultraviolet light, x-rays, and gamma rays. It goes from left to right and the and the ones on the left have less energy than the ones on the right.

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An electromagnetic wave is a traveling oscillation in the electric and magnetic field. The light produced is an electromagnetic one. This wave travels at the speed of light.

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The speed of light is 300,000,000 m/s which is about 1,000,000 times more than the speed of light.

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Color is how we perceive the energy of light. The color we see is the color that is being reflected, which is the one that is not actually in it. White light is the combination of all colors together. Red light has the lowest energy we can see, and violet has the highest energy we can see. Photons are the smallest possible amount of light, in the form of a wave bundle.

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Incandescence is a process that makes light heat. Fluorescence is the process that makes light directly from electricity

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Light is a form of electromagnetic energy that makes things visible. Light travels extremely fast and over long distances, carries energy and information, travels in straight lines, bends and bounces when it comes in contact with objects, has color, and has different intensities, and can be bright or dim. To measure light waves we use nanometers which equivalent to one billionth of a meter.