Photosensitivity: Difference between revisions
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'''Photosensitivity''' is the amount to which an object [[react]]s upon receiving [[photon]]s of [[light]]. Devices that are photosensitive include the human [[retina]] and [[photographic film]]. Film is photosensitive because it has a [[chemical]] reaction when struck by light. |
'''Photosensitivity''' is the amount to which an object [[react]]s upon receiving [[photon]]s of [[light]]. Devices that are photosensitive include the human [[retina]] and [[photographic film]]. Film is photosensitive because it has a [[chemical]] reaction when struck by light. |
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The same process is used in the [[electronic]] device known as a [[photocathode]], which is a surface that emits [[electron]]s when struck by light. An electron tube called a [[photocell]] can be constructed with an [[anode]] and such a photosensitive [[cathode]], both enclosed in a [[vacuum]]. When this is inserted in an electrical circuit it will allow current to flow when the cathode is illuminated with light. |
The same process is used in the [[electronic]] device known as a [[photocathode]], which is a surface that emits [[electron]]s when struck by light. An electron tube called a [[photocell]] can be constructed with an [[anode]] and such a photosensitive [[cathode]], both enclosed in a [[vacuum]]. When this is inserted in an electrical circuit it will allow current to flow when the cathode is illuminated with light. In the Mammal retina there are a newly discovered group of Photosensitive cells called “Photosensitive Ganglion Cells” Its Photo pigment is Melanopsin. |
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Typical [[substance]]s that are photosensitive are [[alkali]] [[salts]], such as [[silver halide]]. |
Typical [[substance]]s that are photosensitive are [[alkali]] [[salts]], such as [[silver halide]]. |
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Revision as of 16:18, 30 August 2005
You may have been trying to reach the article on Photosensitive epilepsy.
Photosensitivity is the amount to which an object reacts upon receiving photons of light. Devices that are photosensitive include the human retina and photographic film. Film is photosensitive because it has a chemical reaction when struck by light. The same process is used in the electronic device known as a photocathode, which is a surface that emits electrons when struck by light. An electron tube called a photocell can be constructed with an anode and such a photosensitive cathode, both enclosed in a vacuum. When this is inserted in an electrical circuit it will allow current to flow when the cathode is illuminated with light. In the Mammal retina there are a newly discovered group of Photosensitive cells called “Photosensitive Ganglion Cells” Its Photo pigment is Melanopsin.
Typical substances that are photosensitive are alkali salts, such as silver halide.