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Light reflection and refraction are two important concepts in physics that deal with the behavior of light when it interacts with different mediums. Here is a brief overview of these concepts:

Reflection of Light:
Reflection is the property of light to return back from a surface when it falls on it. The law of reflection states that the angle of incidence is equal to the angle of reflection. Some important points related to reflection are:

- The incident ray, the reflected ray, and the normal to the reflecting surface, all lie in the same plane.
- The angle of incidence is measured between the incident ray and the normal, and the angle of reflection is measured between the reflected ray and the normal.

Refraction of Light:
Refraction is the bending of light when it passes from one medium to another. The amount of bending depends on the angle of incidence and the refractive index of the two mediums. Some important points related to refraction are:

- The refractive index of a medium is the ratio of the speed of light in vacuum to the speed of light in that medium.
- When light passes from a rarer medium to a denser medium, it bends towards the normal, and when it passes from a denser medium to a rarer medium, it bends away from the normal.
- The amount of bending is given by Snell's law, which states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant for a given pair of mediums.

Applications of Reflection and Refraction:
Reflection and refraction have many practical applications in our daily lives. Some of the important ones are:

- Mirrors work on the principle of reflection and are used for various purposes such as making images, reflecting light, etc.
- Lenses work on the principle of refraction and are used in cameras, telescopes, microscopes, eyeglasses, etc.
- The phenomenon of total internal reflection is used in optical fibers to transmit light signals over long distances.

In conclusion, light reflection and refraction are two important concepts in physics that have many practical applications. Understanding these concepts is essential for students of Class 10 who are studying physics.