Luminous - source of light (produces it's own light)
Non-luminous - an object is un-able to produce its own light or just reflect the light.
Ray- the thinnest possible form of light which we can
still see.
Beam - collection of rays
Incidence ray
Reflected ray
angle of incidence
angle of reflection
Normal line
Medium
refraction
ray of refraction
ray of emergence
angle of refraction
angle of emergence
dense/ density
Incidence ray
Reflected ray
angle of incidence
angle of reflection
Normal line
Medium
refraction
ray of refraction
ray of emergence
angle of refraction
angle of emergence
dense/ density
Sound
frequency - the number of waves (vibrations) in a second
Hertz (Hz) - measurement of frequency
pitch - high or low pitch - what you hear
loudness - volume of sound measured in decibels (dB)
amplitude - the height of the sound wave showing the loudness
Decibel (dB) - unit of loudness
Wavelength - Distance between matching points on the wave (m)
Longitudinal - Vibration at right angle to direction of travel
Transverse - Vibration parallel to direction of travel
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