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The refractive index of a liquid is 1.5. If the velocity of light in vacuum...

Physics
JAMB 2020

The refractive index of a liquid is 1.5. If the velocity of light in vacuum is 3.0 x 10\(^8ms^{-1}\), the velocity of light in the liquid is 

  • A. 1.5 x 10\(^8ms^{-1}\)
  • B. 2.0 x 10\(^8ms^{-1}\)
  • C. 3.0 x 10\(^8ms^{-1}\)
  • D. 4.5 x 10\(^8ms^{-1}\)
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Correct Answer: Option B
Explanation

n = \(\frac{\text{speed in air}}{\text{speed in glass}}\) 

1.5 = \(\frac{3 \times 10^4}{\text{speed in glass}}\)

Speed in glass = 3 x 10\(^8\)m/s / 1.5

= 2 x 10\(^8\)m/s

There is an explanation video available below.


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Explanation Video

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts