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17 Cards in this Set
- Front
- Back
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Light |
A form of energy that travels by electromagnetic waves |
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Reflection |
Light "bounces" off surfaces |
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Incident ray |
The ray of light falling onto the mirror |
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Normal |
The normal is an imaginary line radiating perpendicularly from the mirror at the point where the incident ray strikes the mirror |
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Laws of reflection |
1. The incident ray,normal and the reflected ray are all in the same plane. 2. The angle of reflection is equal to the angle of incidence. |
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Real image |
Actual intersection of light Rays |
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Virtual images |
The apparent intersection of light rays |
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Refraction |
The way in which light "bends" when it passes from one medium to another |
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Snells Law |
The ratio of the sine of angle of incidence to the sine of the angle of refraction is a constant for two given media. |
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Refractive Index of a Medium |
The ratio of sine i to sine r when the light travels from a vacuum to that medium |
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Depth .refractive index |
Real depth / apparent depth |
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Speed.refravtive index |
C1/ C2 |
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Total Internal Reflection |
The optical phenomenon where light is reflected back from a boundary between two media. It occurs when the light travelling towards the rarer medium from the denser one, striking the boundary with an angle of incidence greater than the critical angle for those two Media. |
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Critical Angle |
The angle of incidence in the denser medium which causes an angle of refraction of 90 degrees |
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Power of lens |
Is the inverse of the focal length |
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Spectrum |
Is the range of wavelength present in the electromagnetic radiation. |
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Dispersion |
The spreading out of the different wavelengths of light. |
