When a light ray passes through two different medium, then the direction light change on the surface of the 2nd medium. This phenomenon is known refraction of light.
11-01-2020 78 times Arnab De
The straight line between two points in a light medium is known as a light ray. Surround by two opposite surfaces, both curved piece of transparent medium is known as a lens.
03-01-2020 66 times Arnab De
Light is an energy which main source is sun. The light source be a point or an area. The Travelling medium of light may be the air or any transparent substance.