 #1
jisbon
 476
 30
 Homework Statement:

A singlelens 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 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 doubleslit? 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 doubleslit? If so why is it? Thanks