Lighting in Photography - Some basic knowledge

Light or visible light is the portion of electromagnetic radiation that is visible to the human eye, responsible for the sense of sight. Visible light has a wavelength in a range from about 380 or 400 nanometres to about 760 or 780 nm, with a frequency range of about 405 THz to 790 THz. In physics, the term light often comprises the adjacent radiation regions of infrared (at lower frequencies) and ultraviolet (at higher), not visible to the human eye.

 

                                                       Photo: Ivan Bliznetsov (fotolia.com)
In photography, lighting is sometime more important than the choice of subject. The good view of lighting will improve the quality of picture as well. However, in modern cameras,the sensor of it camera is not nearly as complex and adaptable as the human brain. In other words, cameras cannot see the same as human eyes.
According to Steve (2011), he stated that "Photos are made by “exposing” the film or sensor to light. No light equals no exposure. Too much light equals too much exposure. Therefore, in any given situation there is an amount of light that produces the “correct” exposure". In order to capture a good image, the most important thing is to how to control the light exposure or the amount of light falling into the sensor.Most of the modern digital camera will allow you to control it. Setting the requirement for lighting + some additional adjustment in Photoshop will provide a quality picture.

Reference
Russell, S. (2011). Understanding Light in Photography - Beginner Level. Retieved at
http://www.beyondmegapixels.com/2011/11/understanding-light-in-photography-%E2%80%93-beginner-level/