Questions on thin prism

  1. 1.the angles of thin prism are very small ,that's why the prism is always in the position of minimum deviation angle.
    I don't understand this statement at all!!how to prove this?

    the deviation angle in a thin prism depends upon the refractive index but It doesn't depend upon the angle of incidence because the prism is always in the position of minimun deviation angle.

    I don't understand this either.
    Thanks in advance
     
  2. jcsd
  3. am I using the right word "thin prism"?
     
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