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imatreyu
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Homework Statement
Light of wavelength 460 nm falls on two slits spaced .3 mm apart. What is the required distance from the slits to a screen if the spacing between the first and second dark fringes is to be 4mm?
Homework Equations
Ydark= (([tex]\lambda[/tex]L)/d)(m+1/2)
Using
ydark= .004 m
d= .0003 m
[tex]\lambda[/tex]=4.6e-7 m
L= ? (must find)
m= ? (don't understand)
The Attempt at a Solution
It's basically plug n' chug, but I don't understand what m is supposed to be at all!
The answer is 2.61.
My friend says (m + 1/2) must turn into (3/2 - 1/2) but I don't understand why. . .
Thank you in advance for any help! I really appreciate it. My textbook does a bad job of explaining this.
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