# Homework Help: Circular Diffraction Patterns

1. Jul 16, 2010

### Brown Arrow

Circular Diffraction Patterns HELP!

1. The problem statement, all variables and given/known data

2. Relevant equations

theata_1=1.22(lambda)(L)/D L distance from screen, D diameter of slit

w=2.44(lambda)(L)/D

3. The attempt at a solution
so this is what i did not sure where i went wrong maybe at rounding off...

w=2.44(lambda)(L)/D

(10.3/1000)=92.44)(633*10^(-9))(0.8)/D

solving for D i got the diameter to be the following

D=0.119962....mm

i rounded off to three significant figure

D=0.120mm is this correct b/c when i did this i got it wrong, could some one tell me where i went wrong this.

Last edited: Jul 16, 2010
2. Jul 16, 2010

### Staff: Mentor

Re: Circular Diffraction Patterns HELP!

3. Jul 16, 2010

### Brown Arrow

ok ill try it again and see if it works

4. Jul 16, 2010

### Ush

before you try it a again, there's an option to check what you put as your last answer, ^ might want to check that first before using an attempt

5. Jul 16, 2010

### Brown Arrow

it worked, before i messed up the decimal place, now correct,

Thanks for helping Doc Al
Brown arrow.