What is the process of a glass prism separating sunlight into component colors called?

What is the process of a glass prism separating sunlight into component colors called?
 
  a. Refraction
  b. Birefringence
  c. Sublimation
  d. Dispersion

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(Question #2) Participant observation as a data gathering strategy:
 
  a. usually represents a commitment to a more quantitative research orientation
  b. may pose potential ethical hazards
  c. usually involves minimum contact with subjects
   d. requires that the researcher perform all of the
   activities of the group being studied

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(Question #3) Which type of test would logically be used first by the drug analyst?
 
  a. Gas chromatography
  b. Microcrystalline
  c. TLC
  d. Color

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(Question #4) The specificity of microcrystalline tests is _____ the specificity of color tests.
 
  a. less than
  b. the same as
  c. greater than