Visible light is the spectrum of light that humans can see easily with naked eyes. The visible segment of light is formed by a section of the electromagnetic spectrum that has a wavelength range lying between 0.4 to 0.7 µm. The visible light is also known as white light. It is a combination of seven colours of different wavelengths arranged in a specific order, i.e., violet, indigo, blue, green, yellow, orange and red. This arrangement of colours is usually abbreviated as VIBGYOR. Here, the red colour has the longest wavelength, whereas violet has the shortest wavelength. Visible light is used to create a sense of sight in the eyes of a person that helps him/her to visualize the structure, colour, and appearance of objects present in the surroundings.
Examples of Visible Light
The light that we receive from the sun is a prominent example of visible light in real life. The sunlight appears to be white in colour, but contains a set of seven colours arranged in a specific order according to the value of wavelengths. This set of colours is abbreviated as VIBGYOR and can be observed easily by passing the sunlight through a glass prism.
2. Light Bulb
An electric light bulb is a common light source used in households. It consists of a filament made up of tungsten. When the switch is connected and a closed circuit is formed, the electric current passing through the filament of the electric bulb tends to increase the temperature to a level after which it begins to produce light. The light produced by an electric light bulb is yet another example of visible light in real life.
Fire is produced as a result of the combustion of combustible elements. It is a chemical process that is highly exothermic in nature and causes rapid oxidation of the fuel. Fire tends to release heat, smoke, and light as by-products. The light energy produced by the fire can be seen easily by naked eyes; therefore, fire is one of the best examples of visible light in real life.
4. Glow Sticks
The light that is radiated by the glow sticks into the environment can be seen easily by naked eyes and therefore, is yet another example of visible light in real life. The glow sticks typically consist of two chemical compounds, namely hydrogen peroxide and fluorescent dyes. When the glow stick is present in the rest state, it has a significant amount of potential energy stored in it. The glow sticks are unable to produce light until the chemicals get mixed with each other. Upon shaking the glow sticks, the chemicals get properly mixed with each other. The potential energy gets converted into kinetic energy while shaking the sticks. Finally, producing visible light by converting chemical energy gets into light energy.
Light emission diodes are small electronic components that make use of the conversion and transformation of energy from one form to another. The basic principle of operation of such devices is to use electrical energy as input and release light energy that falls within the visible light range as an output. The application of light-emitting diodes can be seen easily in televisions, fairy lights, lamps, etc.
6. Fire Crackers
Firecrackers contain a special combination of chemicals that undergo a series of reactions and produce visible light upon being ignited. The conversion of chemical energy to light and sound energy can be observed easily while lighting firecrackers. The light produced by the firecrackers is an example of visible light in real life as it can be seen easily with naked eyes.
7. LASER Light
LASER is an acronym for light amplification by the stimulated emission of radiation. LASER is a device that produces a high intensity, narrow beam of visible light through a process of optical amplification that is based on the stimulated emission of electromagnetic radiations.
8. Fluorescent Lamp
A fluorescent lamp is a low-pressure mercury vapour lamp that emits light radiations that fall under the visible range of the electromagnetic spectrum. A fluorescent lamp is also known as a tube light. The main functioning of a tube light is based on the conversion of ultraviolet light into visible light with the help of phosphor coating present on the inner side of the tube.
Moon does not have its own light, but it reflects the sunlight into the surroundings and therefore, is known as the secondary or reflective source of light. This means that the light reflected by the moon is also an example of visible light in real life.