Diffraction, interference, single and double slit setups

  • #1
2
0

Homework Statement:

Hey,
due to the corona—virus here in Germany all schools are closed down. Today our teacher gave us two tasks but I'm not sure which formulars I should use.

1.Calculate the Angel below the 3rd.diffraction minimum behind a single slith that's 0.3 mm width. The laserpointer is a red one with a wave length of 630nm.

2.A parallel red light falls through a double slit. Interference appears on a screen that's 3meters away from the lightsource.The distance between the 1st and zero maximum is 4mm. The column spacing d=0,5mm.
Calculate the Wave length of the red light

Thanks in advance

Relevant Equations:

I have added a picture with my attempts to find a solution and equations..
-
 

Attachments

Answers and Replies

  • #2
etotheipi
Gold Member
2019 Award
2,690
1,602
I think you might have forgotten to multiply by 3 on your calculator for the first part. Also make sure to write ##\theta## in the argument of the ##\sin## function in your working! Also note that for small ##\theta##, we have ##\sin{\theta} \approx \theta## so often we can just use ##\theta = \frac{\lambda}{s}## - though in this case it's small enough that the two are the same to pretty high precision!

I agree with your part 2.
 
Last edited:
  • Like
Likes berkeman
  • #3
2
0
Thank your for the fast reply. I corrected the first one now I got 0.30 degree is this right ?
 
  • #4
etotheipi
Gold Member
2019 Award
2,690
1,602
Thank your for the fast reply. I corrected the first one now I got 0.30 degree is this right ?
If you do want to convert it to degrees, I get a value of 0.36 degrees.
 

Related Threads on Diffraction, interference, single and double slit setups

Replies
1
Views
3K
Replies
3
Views
10K
  • Last Post
Replies
0
Views
2K
Replies
3
Views
691
Replies
0
Views
2K
Replies
4
Views
2K
Replies
5
Views
3K
Replies
6
Views
1K
  • Last Post
Replies
1
Views
3K
Top