Shine the laser light through the
slits on the sheet to project interference patterns on the
screen. The sheet has single slits of various widths,
double slits of various widths and separations, and sets of
different numbers of multiple slits.
Green (532 nm) and red (650 nm) laser pointers can be used to
show the dependence of diffraction angle on wavelength.
of the Cornell sheet is shown at the right.
Column 1: single slits of
Column 2: double slits of
constant width and variable spacing becoming double slits of
constant spacing and variable width, becoming single slit of
Column 3: gratings with
various ratios of slit width to slit spacing
Column 4: gratings with
different numbers of slits, each with same slit width and
Column 5: double slits of
Refer to this
image for slit widths and spacings.
Beside each element:
top digit = number of lines,
digit = width in points before 8x reduction,
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
We also have a diffraction
mosaic slide (202-21-B5) with four double slits and three
multiple-slit arrays. The double slit separations are 45,
58, 75 and 100 Ám. The slit width for the latter is twice that
of the others. The three gratings are 25, 50 and 100