Untitled
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KEY TERMS
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| vocab |
definition |
| absorption |
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| colour |
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| concave lens |
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| converge |
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| convex lens |
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| diverge |
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| focal length |
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| focal point |
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| frequency |
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| lens |
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| light |
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| magnification |
|
| opaque |
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| period |
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| periodic motion |
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| prism |
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| reflection |
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| refraction |
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| translucent |
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| transmission |
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| transparent |
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| visible spectrum |
|
| wave |
|
| wavelength |
|
Light waves
describing waves
light: type of energy
different to sound:
- can travel through space without matter, unlike sound → how sunlight travels from the sun to reach earth
- takes 8 mins for light to reach from sun to earth, nearly 300,000km/sec
- travels in waves
light and colour
- periodic motion: characteristic of wave
- repeating pattern
- highest to lowest to highest again
- period: how long it takes something to go through the motion once
- frequency: how many waves per second
- how many repeating patterns per second
- second/period
- transfer of energy
- wavelength: distance between one crest of a wave and the next crest
- short wavelength have high frequencies
- long wavelength have low frequencies
- longitudinal waves: curve around each other
- transversal wave: regular lines up and down
Frequency and colour
colour: frequency of the light eyes detect
- waves up and down 40 million million times per second
- can tell by looking at colour for what frequency is
- visible spectrum: white light is made up of seven individual colours, seen when spread out
- all other frequencies form a continuous band of colour
- range of all frequencies of light that our eyes can see
- different frequencies correspond to different colours
- as a whole, visible spectrum includes all the colours of the rainbow
- low frequency is red, high frequency is purple