Author Question: A multiple slit diffraction grating has a slit separation of 2.00 10-6 m. Find the wavelength of ... (Read 85 times)

yoooooman · **on:** Jul 28, 2018

A multiple slit diffraction grating has a slit separation of 2.00 10-6 m. Find the wavelength of the monochromatic light that will have its second order (m = 2) bright fringe diffracted through an angle of 43.4. (1 nm = 10-9 m)
a. 616 nm
c. 687 nm
b. 500 nm
d. 120 nm

Question 2

Diffraction grating 1 has twice the lines/cm that diffraction grating 2 does. When used with a certain wavelength of light, both gratings give first order (m = 1) maxima. Which of the following statements is true for the same wavelength of light.
a. Both gratings must also give second (m = 2) order maxima. b. It is possible that neither grating gives a second order maximum.
c. Grating 1 must give a second order maximum.
d. Grating 2 must give a second order maximum.