LIGHT- REFLECTION & REFRACTION (ଆଲୋକ-ପ୍ରତିଫଳନ ଓ ପ୍ରତିସରଣ) class 10 physics ch-6 in odia || Part-1

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Following are the important properties of light –

Light travels in a straight line.
The speed of light is faster than sound. Light travels at a speed of 3 x 108 m/s.
Reflection of light
Reflection is the phenomenon in which light travelling in one medium, incident on the surface of another returns to the first medium, obeying the laws of reflection. According to the laws of reflection

The incident ray, the reflected ray and the normal to the surface at the point of incidence all lie in the same plane.
The angle of incidence is equal to the angle of reflection.
Refraction of light
Refraction is a phenomenon in which there is a change in the speed of light as it travels from one medium to another and there is a bending of the ray of light. The refracted ray obeys the following laws.

The incident ray, the refracted ray and the normal to the surface at the point of incidence all lie in the same plane.
For the given pair of media and for the light of the given wavelength, the ratio of the sin of the angle of incidence to the sin of the angle of refraction is always a constant.
Dispersion of light
The splitting of a ray of white light into its constituent colours is called dispersion.

Diffraction of light
The phenomenon of bending of light around corners of small obstacles and hence it’s encroachment into the region of the geometrical shadow is called diffraction.