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A beam of light travelling in water is incident on a glass which is immersed...

Physics
JAMB 2023

A beam of light travelling in water is incident on a glass which is immersed in the water. The incident beam makes an angle of \(40^o\) with the normal. Calculate the angle of refraction in the glass.

[Refractive index of water = 1.33, Refractive index of glass = 1.5]

  • A. \(29.36^o\)
  • B. \(25.37^o\)
  • C. \(37.21^o\)
  • D. \(34.75^o\)
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Correct Answer: Option D
Explanation

\(n_1\)=1.33; \(n_2\)=1.5;  i=40°; r= ?

from snell's law:

\(n_1\) x sin i=\(n_2\)x sin r

⇒1.33 x sin 40°=1.5 x sin r

⇒sin r = 0.5700

⇒r = \(sin^{-1}\) (0.5700)

 ⇒ r = 34.75

 

 

 

There is an explanation video available below.


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Explanation Video

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