What is light? In simpler terms, it is a form of energy that travels in waves.but To be more precise, it is a type of electromagnetic radiation which consists two components, the electric field and magnetic field. As shown here, the electric field and magnetic field intersect each other at a right angle as they move through a vacuum. It is responsible for the natural phenomena observed through our daily life, such as transmission and reflection of light.Light behaves like a wave.Therefore, we can classify electromagnetic radiation in terms of wavelength. Wavelength is the distance between successive peaks of either the electric field or the magnetic field.Wavelength is usually denoted by the Greek letter lambda.The type of electromagnetic radiation we are interested is the ultra violet or UV and visible light.