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Light and the electromagnetic spectrum
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OverviewEdexcel Topic 5
Light and the
electromagnetic spectrum
Part 1
• Ray diagrams
• Colour (Physics only)
• Lenses (Physics only)
Part 2
• Electromagnetic spectrum
• Radiation and temperature
(Physics only)
• Uses of EM radiation
,Learn!
Know!
Part 1 (Physics only)
• Ray diagrams
• Colour
• Lenses
, Ray diagrams – reflection (Physics only)
A ray diagram is a representation of the path a wave can take to get
from from a source to an observer or screen.
Mirror
Light waves Water waves
The law of reflection states:
Angle of incidence (i) = Angle of reflection (r)
For example:
If a light ray hits a mirror at an angle of incidence of 30o from the
normal the angle of the reflected ray will also be 30o from the normal.
, Ray diagrams – refraction (Physics only)
Refraction of waves at a boundary – ray diagrams
When light strikes a transparent material, some of the light may be
reflected but some will also be refracted.
When light enters a substance of greater density, it will be bent
(refracted) towards the normal line.
Normal
Angle of incidence > Angle of refraction
When light enters a substance of lower
density, it will be bent (refracted) away
from the normal line.
Angle of incidence < Angle of refraction
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