The speed of light in a material is 0.50 c. What is the critical ...

[Medesa]

The speed of light in a material is 0.50 c. What is the critical angle of a light ray at the interface between the material and a vacuum?
 
  A) 30
  B) 21
  C) 24
  D) 27

Question 2

Monochromatic light of wavelength 500 nm is incident normally on a diffraction grating. If the third-order maximum of the diffraction pattern is observed at 32.0 from the central spot, how many TOTAL number of maxima can be seen?
 
  A) 5
  B) 7
  C) 10
  D) 11
  E) 13

Question 3

A He-Ne laser, which produces light of wavelength 632.8 nm, is used to calibrate a diffraction grating. If the first-order maximum occurs at 20.5 from the central spot, what is the distance between the slits of the grating?
 
  A) 0.905 m
  B) 1.81 m
  C) 2.20 m
  D) 3.62 m
  E) 4.52 m

[cpetit11]

Answer to Question 1

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Answer to Question 2

Thank you soo much

Answer to Question 3

B

[Medesa]

TYSM

[Liddy]

Wow, this really help