1
Q
What is Unpolarised light
A
Vibrations of the electric field occur in all possible directions
2
Q
What is Polarised light
A
Vibrations of the electric field occur in one direction only
Perpendicular to the direction of travel
3
Q
What is meant by Coherent
A
Maintain constant phase difference
Have the same frequency and wavelength
4
Q
Diffraction grating (2 marks)
A
A large number of equally spaced parallel slits that diffract light
Producing a pattern of sharp maxima
5
Q
What is a progressive wave
A
A wave that transfers energy from one place to another without transferring matter overall
6
Q
Define wavelength
A
The distance between two consecutive points in phase on a wave (e.g. crest to crest)
7
Q
Define frequency
A
The number of waves passing a point per second (Hz)
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