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Double Slit interference

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Richard Datwyler

on 22 February 2017

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Transcript of Double Slit interference

Double Slit interference
Light is still a wave.
If you have different sources that add together and their phases are different you can get interference.
The path length difference will make interference on the screen.
Full wavelength differences are constructive,
have wavelength differences are destructive.

Light from a laser is incident on a double slit pattern with spacing between the slits as .08 mm. A screen is placed 2.0 m away from the slits and an interference pattern is observed. Seven bright spots are easily observed and spread out over a distance of 7.5 cm. What is the wavelength of the light?
A 589 nm laser creates a first order bright fringe 1.5 cm away from the center bright fringe on a screen 1.75 m away from a double slit, what is the spacing between the two slits?
Where would the second order maximum be if the laser was replaced with one having a 625 nm wavelength?
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