VISIBLE LIGHT Ryan Halim Selvi Susilawati Windy Fauziyah

VISIBLE LIGHT Ryan Halim Selvi Susilawati Windy Fauziyah Tri Haryanto S. A.

Definition Visible light is electromagnetic radiation that is visible to the human eye, and is responsible for the sense of sight. The speed of light in a vacuum is defined to be exactly 299, 792, 458 m/s (approximately 186, 282 miles per second). Or we could say 3 x 108 m/s.

Properties of light • Intensity is the number of photons (packets of energy) falling on a certain area, within some time interval.

Properties of light • Intensity

Properties of light • Wavelength Spectrum Less or more wavelength shows the different. Every colours that we could with our eyes are have different wavelength.

Properties of light

Properties of light Frequency of visible light = 40. 000 – 80. 000 GHz

Properties of light Polarisation Is a property of waves that can oscillate with more than one orientation

Discoverer • In the 13 th century, Roger Bacon theorized that rainbow were produced by a similar process to the passage of light through glass or crystal.

Discoverer • In the 17 th century, Isaac Newton discovered that prisms could disassemble and reassemble white light, and described the phenomenon in his book Optics.

Christiaan Huygens He was a famous Dutch mathematician and natural philosopher. He is known particularly as an astronomer, and physicist. Huygens was a leading natural philosopher of his time. He published major studies of mechanics and optics.

Thomas Young He was an English polymath. Young made notable scientific contributions to the fields of vision, light, solid mechanics, energy, physiology, language, musical harmony, and Egyptology

How We can See it? DISPERSION Dispersion of light can be defined as the separation of polychromatic light separeted into monochromatic light (Red, Orange, Yellow, Green, Blue, Indigo and Violet) colours are obtained when a white light (polichromatic) is dispersed. Dispersion of light happens when light passes through a dispersive medium such as a prism. Like a rainbow, it is formed when light is dispersed through raindrops. Shorter wavelengths, like purple and blue light, bend the most. Longer wavelengths, like red and orange light, bend the least.

Application of Visible Light ü Application in Medical, called Transillumination ü Application in Daily Life ü Solar Panel ü Photo Copy Machine ü Application in Cinematography

Solar Panel • Solar panel is a tool that composed from solar cell that can be change light into electrical energy. They called the sun solar because the sun is the most powerful energy that can be used. Solar Panel is also called photovoltaic, photovoltaic can be meant “electric light”.

Charles Fritts He is an American He discover solar panel at 1883 Fritts coated the semiconductor material selenium with an extremely thin layer of gold. The resulting cells had a conversion electrical efficiency of only about 1% owing to the properties of selenium.

Alexandre Edmond Becquerel (24 March 1820 – 11 May 1891), known as Edmond Becquerel, was a french physicist who is credited with the discovery of the photovoltaic effect , the operating principle of the solar cell in 1839.

Solar Panel

Conclusion Visible light electromagnetic is the electromagnetic wave that could visible by the sense of human sight. Its so much colors that we could see, it formed by the different of electromagnetic wave light. So, there are so much visible electromagnetic wave happen in our life.

Bibliography Ø en. wikipedia. org/wiki/Light Ø physics. about. com/od/lightoptics/a/vislightsp ec. htm Ø en. wikipedia. org/wiki/Dispersion_(optics) Ø http: //en. wikipedia. org/wiki/Christiaan_Huyg ens Ø http: //en. wikipedia. org/wiki/Thomas_Young_ %28 scientist%29