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Which of the following statements about the critical angle for the incident and transmitted rays is...

Which of the following statements about the critical angle for the incident and transmitted rays is correct?

  • There is a critical angle for a light ray coming from a medium with an index of refraction 1.20 and incident on a medium that has an index of refraction 1.40.

  • There is a critical angle for a light ray coming from a medium with an index of refraction 1.40 and incident on a medium that has an index of refraction 1.20.

  • The critical angle is given by sinθc = nt / ni.The critical angle is given by sinθc = nt / ni.

  • The critical angle is given by sinθc = ni / nt.

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