Critical Angle - Formula

Physics

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Factors affecting critical angle

Critical angle is affected by the refractive index of second medium with respect to the first medium. This in turn depends on:
  • Wavelength: Critical angle increases with increase in wavelength (least for violet).
  • Temperature: Critical angle increases with increase in temperature. 

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Relation between refractive index and critical angle

Let us consider medium 1 Incident medium and 2 Refractive medium, Then value of critical angle can be derived by Snell's law.




: Refractive index of denser medium 1 with respect to rarer medium 2.


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