Introduction
Light of Class 7
Are everything visible to us ? Are everything visible to every living things? Are all the living things can see in same pattern?To understand this we have to start with what is visible to us. humans can see is known as visible light. Not all animals can see all types of lights. Like dogs can see only shades of gray and some insects can see light from the ultraviolet part of the spectrum only. Scientists says visible light are the lights that we can see. Light is also known as electromagnetic radiation. Visible light is only one small portion of a family of waves called electromagnetic (EM) radiation.
Light is a form of invisible energy(packets of energy box),which produces the sensation of sight. The object which emit light are known as sources of light or luminous object. A ray of light is a path followed by light energy in a transparent medium. A group of parallel rays of light emitted by the source of light is called beam of light.
NCERT solutions for class 7 Science prepared by Physics Wallah will help you to solve your NCERT text book exercise.
