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PRACTICE / Deviation through a prism

A weak prism bends a ray

A thin prism in air has apex angle 0.040 rad and refractive index 1.50. Use the small-angle prism approximation.

Find its approximate deviation angle.

Organize the givens & assumptions
  • A = 0.040 rad
  • n = 1.50

Thin prism in air; small apex and ray angles in radians; single refractive index 1.50 at the stated frequency.

  1. A0.060 rad0.060\ \mathrm{rad}
  2. B0.040 rad0.040\ \mathrm{rad}
  3. C0.080 rad0.080\ \mathrm{rad}
  4. D0.020 rad0.020\ \mathrm{rad}

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