I just learned when the bottom of the sun touches the horizon, it's already below the horizon. That sounds so crazy I'm going to need to run an experiment to prove it.
Its not TIR , it is due to law of refraction (by Snell's Law) Correct your explanation Bro.👍🏻👍🏻 tan@ = n'/√{(n'+alpha x)² - n' ²} Aftr solving dy/dx Y²=1/√2 × n/n' * x Which is parabola