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Old Oct 9th 2019, 09:35 PM   #1
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A double-slit experiment && Optics

A double-slit experiment produces fringes on a distant screen.
How does the linear separation between the bright maxima on the
screen change when the separation between the slits doubles?
(Answer: reduces by 1/2)
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Old Oct 10th 2019, 07:58 AM   #2
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The formula that relates the fringe characteristics to the experimental set-up is

$\displaystyle \lambda = \frac{Ws}{D},$

where:
$\displaystyle \lambda$ is the wavelength of your light source (in m);
W is the distance between successive fringe peaks, or troughs (in m);
s is the slit separation distance (in m); and
D is the perpendicular distance between the slit panel and the screen.

Using this formula, you should be able to solve your problem. Have a go and let us know how it goes.

Most exam boards supply the above formula on the formula sheet. If not, you should learn it!
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