A. dispersion
B. refraction
C. interference
D. diffraction
Correct Answer: Option B
B. refraction
![A ray of light travelling from glass into ethyl alcohol is incident at the boundary at an angle of incidence 30°. Calculate the angle of refraction. [Refractive index of glass =1.5; refractive index of ethyl alcohol = 1.36]](https://erudites.ng/wp-content/uploads/2020/06/past-questions-and-answers-150x150.jpg "A ray of light travelling from glass into ethyl alcohol is incident at the boundary at an angle of incidence 30°. Calculate the angle of refraction. [Refractive index of glass =1.5; refractive index of ethyl alcohol = 1.36]")
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