The angle θ2 is the angle that shows the degree of the bending of the light ray and is called the anglle of refraction.
What is refraction?
The term refraction has to do with the bending of light rays as it crosss the boundary between two media. Now. we can see that the ray of ligh as shown in the image is undergoing refraction.
Now the angle that has been marked θ2 is the angle that shows the degree of the bending of the light ray and is called the anglle of refraction.
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