#The angle of reflection equals the angle of incidence crack
Crack CRPF Constable Tradesman Exams with Indias Super Teachers. And a direct consequence is that the angle of incidence equals the angle of reflection. In fact, the angle of incidence equals the angle of reflection, according to the law of reflection. This is known as "Fermat's law of refraction," and it says that light seems to magically find the shortest-time path between two points.
But if the path is either the fastest or slowest path from point A to point B, then something magical happens: all of the nearby paths take about the same time, so all of the arrows line up, so you get a very large probability that the object moves in that way. If they all have a different time then each arrow is tilted a little more relative to the last one, and as you add them together, they describe something very circle-like and it will not get far away from the initial point. Now if there is a path, and there are other possible paths "nearby" that one, like on a mirror, we have to consider if they take a different time or not. We add up all of these little arrows by connecting them tip-to-tail and then ask how far away the final point is from the initial point, which is a measure of the probability that the photon goes in that direction.
Each path can be thought of as a little arrow rotating in 2D at a constant rate with respect to time (the photon's "frequency"). Our modern understanding is that a photon is able to sense every path that it could possibly take from A to B. So a single atomic electron that gets excited in this way indeed does not have this property, and indeed a vast number of them can do this in parallel without functioning this way: this is part of the classical explanation for why the sky is blue.įurthermore it matters that the surface is flat: if you cut little parallel lines in the surface then you get a spectrometer this is part of the explanation for why you see rainbows in the "data track" of a CD or DVD.įurthermore you see the same reflection when you analyze things like reflection from a glass, even though there is also a transmitted wave.
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