what are the Important points of chapter Refraction of light
at Curved surfaces : Chapter- 4 (SSC) syllabus class 10 (PHYSICS)
Answers
*what is refraction
* laws of reflection
* refractive index
* Dispersion of light
* partial and internal reflection
Answer:
what is refraction?
Refraction : The phenomenon of change in the direction of light when it passes from one transparent medium to another is called refraction. Laws of refraction: (i) The incident ray, the refracted ray and the normal to the interface of two transparent media at the point of incidence, all lie in the same plane.
Laws of reflection
The law of reflection states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection.
Refractive index
The refractive index of a material is a dimensionless number that describes how fast light travels through the material. It is defined as where c is the speed of light in vacuum and v is the phase velocity of light in the medium.
Dispersion of light
Dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency. Media having this common property may be termed dispersive media. Sometimes the term chromatic dispersion is used for specificity. Wikipedia
Partial and internal reflection
Total internal reflection is a phenomenon of reflection of ray back to the same medium when passing from denser medium to rarer medium in a such away that angle of incidence greater than its critical angle.
Partial Reflection occurs when a wave is travelling between two mediums. Some of the wave is reflected back and the rest is refracted through into the other medium. The sun will reflect part of its light off of the water, and the rest will refract into the water.