Pages in this set

Page 1

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Polarisation
Definition Aerials Sunglasses
Malus's Law

Page 2

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Polarisation
Transverse waves only. Unpolarised
waves ­ plane of wave oscillation is
randomly orientated.

Page 3

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Polarisation
Plane polarised waves ­ all waves
have matching planes of oscillation
e.g. vertical or horizontal.

Page 4

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Polarisation
In this example, the polariser's
"preferred plane of polarisation" is
vertical.
This means it will only let through
vertically polarised waves and
absorb the rest.

Page 5

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Polarisation
A polariser for microwaves is made
from parallel metal bars.
A polariser for optical wavelengths
is made from parallel polymer
chains.

Page 6

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Polarisation
Charged particles are free to
oscillate along the metal bars (or
polymer chains)
So they absorb electromagnetic
waves which oscillate parallel to
those bars/chains

Page 7

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Aerials
Examples of polarised (selective)
absorbers ­ Short horizontal metal
bars on television aerials.
(Therefore TV broadcasts are
horizontally plane polarised)

Page 8

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Sunglasses
Polymer chains in certain plastics ­
Polaroid sunglasses. Reflected glare
from horizontal surfaces is
horizontally plane polarised.
Horizontal polymer chains in
polarising sunglasses only let
through vertically polarised light
(and so block the glare)

Page 9

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Malus's Law
If the angle of rotation between two
parallel polarisers is then the
Intensity, I of the transmitted light
is given by:
I =I
o
Cos2
Where intensity I o
on is the the incident second polariser.
(Malus's Law is no longer on the spec
but you will still…

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Polarisation of waves

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Pages in this set

Page 1

Preview of page 1
Polarisation
Definition Aerials Sunglasses
Malus's Law

Page 2

Preview of page 2
Polarisation
Transverse waves only. Unpolarised
waves ­ plane of wave oscillation is
randomly orientated.

Page 3

Preview of page 3
Polarisation
Plane polarised waves ­ all waves
have matching planes of oscillation
e.g. vertical or horizontal.

Page 4

Preview of page 4
Polarisation
In this example, the polariser's
"preferred plane of polarisation" is
vertical.
This means it will only let through
vertically polarised waves and
absorb the rest.

Page 5

Preview of page 5
Polarisation
A polariser for microwaves is made
from parallel metal bars.
A polariser for optical wavelengths
is made from parallel polymer
chains.

Page 6

Preview of page 6
Polarisation
Charged particles are free to
oscillate along the metal bars (or
polymer chains)
So they absorb electromagnetic
waves which oscillate parallel to
those bars/chains

Page 7

Preview of page 7
Aerials
Examples of polarised (selective)
absorbers ­ Short horizontal metal
bars on television aerials.
(Therefore TV broadcasts are
horizontally plane polarised)

Page 8

Preview of page 8
Sunglasses
Polymer chains in certain plastics ­
Polaroid sunglasses. Reflected glare
from horizontal surfaces is
horizontally plane polarised.
Horizontal polymer chains in
polarising sunglasses only let
through vertically polarised light
(and so block the glare)

Page 9

Preview of page 9
Malus's Law
If the angle of rotation between two
parallel polarisers is then the
Intensity, I of the transmitted light
is given by:
I =I
o
Cos2
Where intensity I o
on is the the incident second polariser.
(Malus's Law is no longer on the spec
but you will still…

Page 10

Preview of page 10

Comments

No comments have yet been made