Reflection of Light| আলোর প্রতিফলন | SSC physics Chapter 8|Orange sir physics|(Lecture-8.1)
10In this video we have discussed about a very basic chapter of optics.That is reflection of light.In this particular lecture we have just discussed about nature of light and electromagnetic spectrum.This lecture is taken by our honorable teacher orange sir.
A light ray is a line or curve that is perpendicular to the light's wave fronts (and is therefore co linear with the wave vector).
A slightly more rigorous definition of a light ray follows from Fermat's principle, which states that the path taken between two points by a ray of light is the path that can be traversed in the least time.
Geometrical optics is often simplified by making the paraxial approximation, or "small angle approximation." The mathematical behavior then becomes linear, allowing optical components and systems to be described by simple matrices. This leads to the techniques of Gaussian optics and paraxial ray tracing, which are used to find basic properties of optical systems, such as approximate image and object positions and magnifications.
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