Double Slit Interference

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Homework Statement


We have the wavelength of 550nm and the distance (d) of 0.120mm. I need to calculate the the angle q.
The diffirent parts of this questions corresponds to the diffirent order of n. a) Being n=1 b) n=5 c) n=10

Given variables;
Wavelength = 550nm = 550*10^-9m
d=0.120mm = 0.00012m
n1= 1
n2= 5
n2 = 10

Homework Equations


The relevant equation for this is;

d*sin0 = n*Wavelength
0 = sin((n*Wavelength)/d))

The Attempt at a Solution



I've attempted the solution to this and my real problem is that I have got no idea how to get the answer to Degrees. I'd really like to see someone do this so I can see what you do and how I should think.
 

Answers and Replies

  • #2
Kurdt
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What answers are you getting? You have the correct formula if you are using the inverse sine function.
 
  • #3
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What answers are you getting? You have the correct formula if you are using the inverse sine function.
The answer im getting is like 0.004[insert alot of numbers here]
The answer it's supposed to be is 29degrees.

The question is; How do I get the answer that I got 0.004(something) to degrees?
You try it and we can see how you do it.

The answer is supposed to be 29degrees.
 
  • #4
Kurdt
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Science Advisor
Gold Member
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Hmm, going through myself I can get nowhere near the answer. The only thing I can think of is the slit distance should be about 1.1 micrometres to get 29 degrees for the first order.
 

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