Monochromatic light from a He-Ne laser (l = 632.8 nm) is incident ...

[ENagel]

Monochromatic light from a He-Ne laser (l = 632.8 nm) is incident on a diffraction grating containing 5 000 lines/cm. Determine the angle of the first-order maximum.
 a. 18.4
  b. 39.2
  c. 14.6
  d. 27.7
  e. 13.9

Question 2

A single slit of width a is illuminated by light of wavelength l. If a = 4.3l, the maximum number of dark fringes on a semi-circular screen surrounding the slit is
 a. 2.
  b. 4.
  c. 6.
  d. 8.
  e. 9.

[ecox1012]

Answer to Question 1

A

Answer to Question 2

D