Northwestern Physics Demos                                 Go back to LIGHT  
DCS# 6D20.10NWU# O-2 Location:    4 B-1
title: Diffraction Slits
aka:  Cornell slit film  also Pasco Diffraction set

Description:
Laser aimed at differing slit arrangements.  Use front surface mirror to increase the throw length.  Pasco slit set also available.

Questions?
   What is the main difference between single and double slits?
   Which single slit is the narrowest on the film?
   What happens when the double slits get closer together?
   What happens when there are multiple single slits equally spaced?

Notes on the Cornel Slit Film (as shown in the picture):
top row: double slits getting closer together.
2nd row: 5 evenly spaced slits, then 4,3,2 & 1
3rd row: different slit density gratings, greatest at center.
4th row: continuously variable single/double slit
5th row: single slit, growing wider.

PASCO slits on far right:
Multiple slit set:
     Double slits, multiple slits, variable double slits, Comparisons

Single Slit Set
     single slits, variable slit, patterns, circular apartures.
pix of set up