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12 Cards in this Set
- Front
- Back
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Reflection and color |
When a color is seen, it is because an object has absorbed light waves that are not that color. |
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How is color determined? |
Color is determined by the frequency and wavelength of light |
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Reflection of light |
Light reflects as a wave. Thus , the angle at such a wave bounces off a barrier is equivalent to the angle of incidence |
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Specular reflection |
Rays of light are reflected in a single angular direction (eg, a mirror). Occurs when am object is smooth or polished |
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Diffuse election |
Reflection when light is cast of in multiple angles, as in when the reflecting object is rough |
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Refraction of light |
This property of light refers to the extent which might changes direction or speed when it goes from one medium to another (eg a straw appears to move sideways when it enters water) |
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Index of refraction |
The speed of light in a vacuum/died of light in the new medium |
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Photons |
Particles of light. Also known as quantums |
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Photoelectric effect |
A substance may emit electrons when it is exposed to photons of light |
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Photons and eyesight |
When a photon strikes the eye, it creates an electromagnetic signal which is translated to the brain as a visual image |
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Radio waves |
Radio waves have the largest wavelengths, from a foot to miles long. They are used extensively in communications. |
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Microwaves |
Have wavelengths in the centimeter range. Can penetrate clouds, smoke and light rain |
