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Types of progressive waves (Polarised Waves (A POLARISING FILTER can be…
Types of progressive waves
Real application
Glare reduction
This reduces the intensity of the light that is entering your eye. It can be used in Polaroid glasses to reduce glare.
This partially-polarised light can then be put through a polarising filter to produce polarised light. This allows us to see underwater shapes more clearly. As partially polarised light can be produced through unpolarised light reflecting off of surfaces of water, as well.
unpolarised light can hit glass block at a right angle to produce partially-polarised light (some of the light waves are vibrating in the same direction).
Improving TV and radio signals
All signal emitters are horizontal, so all TV rods are positioned horizontally when a house is built.
It's the same with a radio as well. If you try and tune a radio by moving the aerial around your signal will come and go as the receiving rods go in and out of alignment with the transmitting rods.
TV signals are polarised by the orientation of the rods on top of houses. To receive a strong signal, you will have to line up the receiving rods with the rods emitting the signal.
Longitudinal Waves
A sound wave consists of alternate compressions and rarefractions of the medium that it's travelling through. This is why sound can't travel through a vacuum.
Sound waves are examples of longitudinal waves. A slinky is also a good example of a longitudinal wave, alongside a P-wave (another type of earthquake).
Longitudinal wave - the displacement of the wave is parallel to the propagation direction of the wave.
Polarised Waves
A POLARISING FILTER can be used to polarise these unpolarised waves. It only transmits waves that are vibrating in a certain direction.
If a filter is vertical and an unpolarised transverse wave comes at it then only vertical vibrating waves will pass through it.
Unpolarised waves are waves which have a displacement in all different directions.
If two polarising filters are placed perpendicular to each other, then no light will be able to get through at all.
E.g. vertical weaves will get through the first polarising filter, however, the second polarising filter will be horizontal meaning these vertical waves won't be able to get through either.
Transverse waves
ALL EM WAVES ARE TRANSVERSE.
Some other examples of transverse waves are:
S-waves (earthquakes).
ripples in water.
waves on strings.
Transverse wave - The displacement of the wave is perpendicular to the prorogation direction of the wave.