# Double Slit Interference

## 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.

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Kurdt
Staff Emeritus
Gold Member
What answers are you getting? You have the correct formula if you are using the inverse sine function.

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.

Kurdt
Staff Emeritus