Diffraction Grating calculation of
light wavelength
And you
Question #1
• A diffraction grating has 20,000 slits/inch. What is the distance
between 2 slits (in meters)? * 2.54 cm = 1 in
• 1.27 x 10-6 m
Question #2
• If the distance between the central bright spot and the 1st bright spot
to the side is 0.43 m, and the length between the diffraction grating
and the wall is 1.6m, then what is the wavelength of the light being
used?
• 3.41 x 10-7 m
Question #3
• If the distance of the diffraction grating is increased to 2.63 x 10-4 m,
then which of the 4 variables (X, L, d, or λ) will change?
•X
Question #4
• What will the new measurement of X be?
• .002 m
Question #6
• Therefore, if you increase the d (distance between lined on the
diffraction grating) the X (diffraction pattern) will increase, or
decrease?
• Decrease (get smaller)