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If light rays of a specific color and of a pair of specific medium refract from one medium to another medium then the ratio of sin of the incidence angle and the sin of the refraction angle is called the refractive index of the second medium with respect to the first medium for that color.
A real image is an image which is located in the phase of convergence for the light rays that originate from a given object.
Reflection off of rough surfaces such as clothing, paper, and the asphalt roadway leads to a type of reflection known as diffuse reflection.
While traversing from the first medium into the second medium, if a part of light returns to the first medium, the phenomenon is called reflection.
An optical fiber is a very thin fiber of glass used for carrying light by total internal reflection of light.
The lens which mid portion is thicker than the edges is called Convex lens.
The distance between the pole and the principal focus of a spherical mirror is called the focal length of the mirror.