a) State the Fermal principle b) use this principle to establish the Snell's law c) A step index fibre 0.000625cm diameter has a core index of 1.53 and a cladding of 1.39 . See figure in the image below. Such class fibre are used frequently in applications such as communication, sensing etc. What is the maximum acceptance angle for core of light rays incident on the fibre face such that the deflected ray in the core

Physics - Unit: Applications of the Wave Nature of Light Many camera lenses are manufactured with a thin film over the glass to minimizereflection. Using diagrams and words, explain how this anti-reflective coating works.Discuss how the following variations will affect the properties of the anti-reflectivecoating.a. Changing the wavelength of lightb. Changing the angle of incidence of light

Snell's Law and the Law of Reflection explain how light is redirected when it encounters a surface between two media.  In the extreme, light may only reflect at a boundary, and go back into the medium it was in.  More often, some of it reflects and some goes through.  If the boundary is plane and flat, then these laws are easy to interpret.  When the boundary is curved, they describe happens at every point on the surface. One of the class types of glass is called "crown" glass, which has an index of refraction for visible light of 1.52 and is usually free of significant impurities. It was one of the first glasses discovered, and windows are made from it.  Another glass is called "flint" glass, and it has lead oxide added, which makes it heavier, more "dispersive" and colorful, and   increases its index of refraction to 1.62.        For the flint glass, the refracted ray goes through the glass to the other side.  If the glass is a parallel slab, what happens when the ray reaches the…

Your boss calls you in his office and hands you the plot shown below. The plot represent data of reflection coefficient for an EM-wave at oblique incidence. It includes the index of refraction of the second medium (n2) and also an angle that your boss does not understand what it is. Your boss tells you that in 30 min, the customer will call back and wants the following information: 1. What polarization has been used to obtain the data 2. What is the index of refraction of the first medium and whether or not is an external or internal reflection. 3. What does the number right above the x-axis represent. 1.5 n;= 3 0.5 41.42 -0.5 10 20 30 40 50 60 70 80 90 Angle of incidence Reflection Coefficients