What is the angular separation of the two second-order spectral ...

[bio_gurl]

What is the angular separation of the two second-order spectral lines having wavelengths 417 nm and 388 nm using a diffraction grating having 456 lines/mm?
 
  A) 1.63
  B) 1.52
  C) 0.815
  D) 3.26

Question 2

Light of wavelength 687 nm is incident on a single slit 0.75 mm wide. At what distance from the slit should a screen be placed if the second dark fringe in the diffraction pattern is to be 1.7 mm from the center of the diffraction pattern?
 
  A) 0.39 m
  B) 0.47 m
  C) 0.93 m
  D) 1.1 m
  E) 1.9 m

[parshano]

Answer to Question 1

Answer: A

Answer to Question 2

Answer: C

[bio_gurl]

Excellent

[Missbam101]

Gracias!