Ray Optics - Lecture 2 | Velocity of Images | Unacademy NEET | LIVE DAILY | Physics | Mahendra Sir

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Lecture 2 on Ray Optics for Class 12 students by Mahendra Sir on Unacademy NEET in which he will discuss Velocity of Images.

A light ray is a line or curve that is perpendicular to the light's wavefronts (and is therefore collinear 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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