Question

Why does the angle of waves change in refraction instead of just altering the relative position of each component the medium?

Answer 1

medium at a different angle, how it is influenced by ... Spheres reflected in the floor and in each other. ... of or at least part of the wave front returns into the medium ... ☺ ☺

Answer 2

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✔The maximum possible angle of refraction is 90-degrees. If you think about it (a practice that always helps), you recognize that if the angle of refraction were greater than 90 degrees, then the refracted ray would lie on the incident side of the medium - that's just not possible.


So in the case of the laser beam in the water, there is some specific value for the angle of incidence (we'll call it the critical angle) that yields an angle of refraction of 90-degrees. 

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