White light is spread out into spectral hues by a diffraction ...

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White light is spread out into spectral hues by a diffraction grating. If the grating has 1 000 lines per cm, at what angle will red light (l = 640 nm) appear in first order?
 a. 14.7
  b. 7.35
  c. 17.7
  d. 3.67
  e. 1.84

Question 2

A helium-neon laser (l = 632.8 nm) is used to calibrate a diffraction grating. If the first-order maximum occurs at 20.5, what is the line spacing, d?
 a. 1.81  10-6 m
  b. 1.00  10-5 m
  c. 1.00  10-4 m
  d. 1.31  10-6 m
  e. 6.76  10-7 m

[quynhmickitran]

Answer to Question 1

D

Answer to Question 2

A

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Wow, this really help

[kilada]

Thanks for the timely response, appreciate it