Physics Notes On – Law Of Refraction – For W.B.C.S. Examination.
When a beam of light passes through two different media via an interface, its behaviour is governed by the laws of refraction of light. These laws are also known as Snell’s law.Continue Reading Physics Notes On – Law Of Refraction – For W.B.C.S. Examination.
The two laws followed by a beam of light traversing through two media are:
The ray of light incident to the interface, the normal trajectory of the beam (from the point of incidence), and the refracted ray must all lie in the same plane.For any two different media, the since of the angle at which the beam of light is incident is always proportional to the sine of the angle at which the refracted ray emerges.
In other words, the quotient of the sine of the angle of incidence and the sine of the angle of refraction is always constant.
It is important to note that insight into the extent to which a particular medium refracts a beam of light is given by the refractive index of that medium.
The point of refraction is created where the incident ray lands and the angle that it makes with the refracted ray not forgetting the normal line that is dropped on the plane perpendicularly.
The medium through which the rays of light are passing creates a considerable difference in refraction unlike in reflection of light. The refractive indices make the dependency on the medium apparent in Snell’s Law.
The normal on the surface is used to gauge the angles that the refracted ray creates at the contact point. n1 and n2 are the two different mediums that will impact the refraction.
The refractive index of water is 1.33 whereas the refractive index of air is 1.00029. Thus, to understand the concept of Snell’s Law let’s consider the light of wavelength 600nm that goes from water into the air. To calculate the angle made by the outgoing ray we apply the figures in the formula mentioned above.
1.33 sin 30o = 1.00029 sin x
x = 41o
When one fishes with a spear it is not as difficult as fishing with a rod as the fisherman has to encounter refraction in the latter case.
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