Optics > Diffraction DCS# 6C10.12

SINGLE SLIT PATTERN


APPARATUS
 
Cornell slitfilm plate or adjustable slit
202-21-B5
laser 202-21-B6


DESCRIPTION Shine the laser through the slits on the plate to project interference patterns on a white board or projection screen.  The plate has single slits of various widths, double slits of various widths and separations, and sets of different numbers of multiple slits.

To smoothly vary the width of the slit, use the adjustable slit (shown below) rather than the Cornell plate.  If you want to know the width of the slit, use the Cornell plate.



Green (532 nm) and red (650 nm) laser pointers can be used to show the dependence of diffraction angle on wavelength.


CAL sheet
NOTES
Refer to this image for slit widths and spacings. 
Beside each element:
top digit = number of lines, 
middle digit = width in points before 8x reduction,       
bottom digit = spacing in points between lines
(one point = 0.013837 inch = 0.3523 mm).
The distance in millimeters between the slits is shown under the patterns.