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A beam of light is incident from air to water at an angle of 30\(^o\)....

Physics
JAMB 2018

A beam of light is incident from air to water at an angle of 30\(^o\). Find the angle of refraction if the refractive index of water is 4/3

  • A. 15\(^o\)
  • B. 18\(^o\)
  • C. 22\(^o\)
  • D. 24\(^o\)
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Correct Answer: Option C
Explanation

X = \(\frac{4}{3}\) r = ?

  Shell’s law:.  = \(\frac{Sin i^0}{ Sin r^0}\)

  = \(\frac{Sin 30^0}{Sin r^0}\)

  Sin\(r^0\) = \(\frac{3 Sin 30^0}{4}\)

  Sin \(r^0\) = 0.375

  R \(^o\) = Sin-1 (0.375)

  R \(^o\) = 22.02 \(^o\)

  R \(^o\) = 22 \(^o\)

There is an explanation video available below.


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Explanation Video

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WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995