# Diffraction

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• Created by: apple87
• Created on: 26-05-15 11:36
When the gap is a lot bigger than the wavelength diffraction is...
Unnoticeable
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When the gap is several wavelengths wide diffraction is..
Noticeable
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When do you get the most diffraction?
When the wavelength is the same size as the gap.
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When are most of the wave reflected back?
When the gap is smaller than the wavelength.
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What happens when a wave meets an obstacle?
Diffraction around the edges and a shadow behind the object
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What happens to the shadow when the objects gets wider?
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What happens if the wavelength of a light wave is roughly the size of the apertue?
Diffraction pattern of light and dark fringes.
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What does the pattern look like?
Bright central fringe with alternating dark and bright fringes on either side of it.
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How does the width of the slit affect the diffraction pattern?
Th narrower the slit the wider the diffraction pattern.
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What sort of light source needs to be used in a slit experiment?
Coherent
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Where is the brightest point of a difraction pattern?
Where the light passes in a straight line from the slit to the screen. The light wave at this point are in phase.
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Where is there a constant phase difference?
At the other bright points that are to the sides of the central bright point.
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What shape to the phasors form when there is a dark fringe, and what is the resultant?
Circle which gives a reultant of zero
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## Other cards in this set

### Card 2

#### Front

When the gap is several wavelengths wide diffraction is..

Noticeable

### Card 3

#### Front

When do you get the most diffraction?

### Card 4

#### Front

When are most of the wave reflected back?

### Card 5

#### Front

What happens when a wave meets an obstacle?