The correct option is 3.
What is the angle of incidence and refraction?
The angle formed at the point of incidence between the incident ray and the normal is called the angle of incidence. The angle formed between the refracted ray and the normal is called the angle of refraction. The angle of Incidence and Angle of Refraction.
What is N in Snell's law?
As in reflection, we measure the angles from the normal to the surface, at the point of contact. The constants n are the indices of refraction for the corresponding media.
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