Interference

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Information about Interference
Education

Published on March 24, 2009

Author: christaines

Source: slideshare.net

interference

Conditions for interference Sound waves Light waves Young’s double slit experiment

Conditions for interference

Sound waves

Light waves

Young’s double slit experiment

Conditions for interference All waves exhibit interference Constrictive Destructive For Interference: The sources must be coherent. The sources should be monochromatic

All waves exhibit interference

Constrictive

Destructive

For Interference:

The sources must be coherent.

The sources should be monochromatic

Sound waves

Sound waves leave speakers in phase Relative phase along XY depends on distance travelled Maximum if path difference = n  Minimum if path difference = (n + ½) 

Sound waves leave speakers in phase

Relative phase along XY depends on distance travelled

Maximum if path difference = n 

Minimum if path difference = (n + ½) 

Light waves V. rare to observe light interfering to produce dark region Usually random polarisation and phase Hence no steady interference pattern 1801: Young produced double slit experiment

V. rare to observe light interfering to produce dark region

Usually random polarisation and phase

Hence no steady interference pattern

1801: Young produced double slit experiment

 

 

Light bands = maxima – due to constrictive interference i.e. path difference = n  Distance between maxima, w depends on: Slit separation, s Wavelength of light,  Distance, D between slits and screen  = ws D

Light bands = maxima – due to constrictive interference

i.e. path difference = n 

Distance between maxima, w depends on:

Slit separation, s

Wavelength of light, 

Distance, D between slits and screen

 = ws

D

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