- #1

jisbon

- 476

- 30

- Homework Statement
- A single-lens generates a diffraction pattern of dark and bright fringes on a screen

located 2 m away from the lens. If the first and the second dark fringes are

separated by 0.1 mm distance, determine the lens diameter. Assume that the light

source operates at 633 nm of wavelength. What is the minimum distance that the

lens can resolve on the screen?

- Relevant Equations
- ##d\sin \theta =m\lambda##

Hi all,

So far all the problems I dealt with is dealing with double slits when working with dark and bright fringes. In this case, what should I do in regards with a lens? Also, what does the question mean when it asks for the

Assuming I can treat them as a double slit,

##d\sin \theta =(m+1/2)\lambda##

First dark fringe m= 0, 2nd dark fringe m=1,

From there I can find and compare the distance etc.

So the question is can I treat it as double-slit? If so why is it? Thanks

So far all the problems I dealt with is dealing with double slits when working with dark and bright fringes. In this case, what should I do in regards with a lens? Also, what does the question mean when it asks for the

__minimum distance that the lens can resolve on the screen? Does it mean the minimum distance between the lens and the screen to form the fringes?__Assuming I can treat them as a double slit,

##d\sin \theta =(m+1/2)\lambda##

First dark fringe m= 0, 2nd dark fringe m=1,

From there I can find and compare the distance etc.

So the question is can I treat it as double-slit? If so why is it? Thanks