The sun, stars, fires, candles, and electric light bulbs are all examples of light sources. They give off light that allows us to see objects around us. Visible light is a type of electromagnetic radiation detectable by the human eye with wavelengths between 380-740 nanometers. It travels at 299,792,458 meters per second in a vacuum and exhibits properties of both waves and particles. The study of light, called optics, is an important area of modern physics research.
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About electromagnetic spectrum and waves. Relationship between Wavelength, Frequency, and Energy.
How frequency changes with wavelength. Visible Spectrum, Radio waves, Infra-Red, Ultra Violet, Gama Rays, etc.
1. Examples of source of light
The sun is a light source
Stars are a light source.
A fire is a light source.
A candle is a light source.
An electric light bulb is a light source.
Explain why you consider it as a
source of light?
Because it gives light around us.
What is light?
Visible light" redirects here. For light that cannot be seen
with human eye, see Electromagnetic radiation. For other
uses, see Light (disambiguation) and Visible light
(disambiguation).
Visible light (commonly referred to simply as light)
is electromagnetic radiation that isvisible to the human
eye, and is responsible for the sense of sight.[1] Visible
light has awavelength in the range of about
380 nanometres to about 740 nm – between the
invisible infrared, with longer wavelengths and the
invisible ultraviolet, with shorter wavelengths.
Primary properties of visible light are intensity,
propagation direction, frequency orwavelength spectrum,
and polarisation, while its speed in a vacuum,
299,792,458 meters per second (about 300,000 kilometers
per second), is one of the fundamentalconstants of
nature. Visible light, as with all types of electromagnetic
radiation (EMR), is experimentally found to always move
at this speed in vacuum.
2. In common with all types of EMR, visible light is emitted
and absorbed in tiny "packets" called photons, and
exhibits properties of both waves and particles. This
property is referred to as the wave–particle duality. The
study of light, known as optics, is an important research
area in modern physics.
In physics, the term light sometimes refers to
electromagnetic radiation of any wavelength, whether
visible or not.[2][3] This article focuses on visible light. See
the electromagnetic radiation article for the general term.
![Examples of source of light
The sun is a light source
Stars are a light source.
A fire is a light source.
A candle is a light source.
An electric light bulb is a light source.
Explain why you consider it as a
source of light?
Because it gives light around us.
What is light?
Visible light" redirects here. For light that cannot be seen
with human eye, see Electromagnetic radiation. For other
uses, see Light (disambiguation) and Visible light
(disambiguation).
Visible light (commonly referred to simply as light)
is electromagnetic radiation that isvisible to the human
eye, and is responsible for the sense of sight.[1] Visible
light has awavelength in the range of about
380 nanometres to about 740 nm – between the
invisible infrared, with longer wavelengths and the
invisible ultraviolet, with shorter wavelengths.
Primary properties of visible light are intensity,
propagation direction, frequency orwavelength spectrum,
and polarisation, while its speed in a vacuum,
299,792,458 meters per second (about 300,000 kilometers
per second), is one of the fundamentalconstants of
nature. Visible light, as with all types of electromagnetic
radiation (EMR), is experimentally found to always move
at this speed in vacuum.](https://image.slidesharecdn.com/examplesofsourceoflight-121212064452-phpapp02/85/Examples-of-source-of-light-1-320.jpg)
![In common with all types of EMR, visible light is emitted
and absorbed in tiny "packets" called photons, and
exhibits properties of both waves and particles. This
property is referred to as the wave–particle duality. The
study of light, known as optics, is an important research
area in modern physics.
In physics, the term light sometimes refers to
electromagnetic radiation of any wavelength, whether
visible or not.[2][3] This article focuses on visible light. See
the electromagnetic radiation article for the general term.](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)