Light
Light travels in straight lines as a wave. It is a form of radiation known as visible light. Other forms of radiation include: UV rays, gamma rays, x rays, microwaves. Light (visible) is transferred through space at a speed of 300 000km/sec. It has a wave length of 1/2000 or 0.005mm. Some objects produce their own light e.g. light bulbs, sun, fire. Some objects reflect light e.g. moon, most objects we see. Some objects bend (refract) light. Some objects absorb light. The electromagnetic spectrum is the variety of all possible incidences of electromagnetic radiation. The "electromagnetic spectrum" of an object is the typical scattering of electromagnetic radiation released or absorbed by that exact object.
Reflection
Light can change direction by using objects like mirrors and other similar surfaces. The 1st law states that the angle of incidence equals the angle of reflection. Reflection of light (and other forms of electromagnetic radiation) happens when the waves come across a surface or other limits that doesn’t absorb the energy of the radiation and rebounds the waves away from the surface. The simplest model of visible light reflection is the surface of a flat water, where happening light is mirrored in an neat way to make a vibrant image of the scenery neighboring water. When something rattles or is thrown into water it becomes disturbed disrupt the reflection by spreading the reflected light rays in all directions.
Refraction
Refraction of light is the indirect of a wave when it comes in a medium and where its speed is changed. The refraction of light is when it passes from a fast medium to a relaxed medium, which bends the light ray towards the normal to the limit among the two means.
Diffraction
Diffraction of light is a long opening of microscopic width which is illuminated by light diffracts the light into sequences of round waves and the wave front which appears from the opening is a cylinder-shaped wave of unchanging power.
An opening which is wider than a wavelength creates interference effects in the space downstream of the opening. These can be explained by assuming that the opening acts as if it has a great number of point sources spread out evenly across the width of the opening. The study of this structure is basic if we study light of a single wavelength. If the instance light is one-color, these sources all have the same point. Light occurrence at a certain point in the space downstream of the opening is made up of backings from each point sources and if the virtual stages of these assistance's vary by 2π or more, and may imagine to find specks and most in the diffracted light. Stage changes are produced by alterations in the path measurements which backing rays reach the point from the opening.
An opening which is wider than a wavelength creates interference effects in the space downstream of the opening. These can be explained by assuming that the opening acts as if it has a great number of point sources spread out evenly across the width of the opening. The study of this structure is basic if we study light of a single wavelength. If the instance light is one-color, these sources all have the same point. Light occurrence at a certain point in the space downstream of the opening is made up of backings from each point sources and if the virtual stages of these assistance's vary by 2π or more, and may imagine to find specks and most in the diffracted light. Stage changes are produced by alterations in the path measurements which backing rays reach the point from the opening.
The electromagnetic spectrum is the range of wavelengths or frequencies over which electromagnetic radiation extends.
What is Light?
The electromagnetic spectrum spread out from low frequencies used for modern radio communication to gamma ray at the short-wavelength end, covering wavelengths from thousands of kilometers down to a portion of the size of an atom. It is for this reason that the electromagnetic spectrum is studied for spectroscopic drives to characterize matter. The maximum for long wavelength is the dimension of the universe, and the short wavelength maximum is in the surrounding area. But in principle the spectrum is immeasurable and continuous.
Bibliography
http://www.globio.org/glossopedia/article.aspx?art_id=50