Prakaas (Light in English) ek rakam ke energy hae. Ii ek rakam ke electromagnetic radiation hae, jon ki uu wavelength me hae jiske insaan ke aankhi se deka jaae sake hae.[1] Physics me, light sabd ke matlab, koi bhi wavelength ke electromagnetic radiation hae, chaahe iii dekhae nai to, nai dekhae.[2][3] Light, chhota chhota packets, jiske photons bola jaawe hae, me rahe hae. Iske properties duuno wave aur particles ke rakam rahe hae. Light ke parhai ke optics bola jaawe hae.

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  1. International Commission on Illumination 1987. International Lighting Vocabulary. Number 17.4. CIE, 4th edition. ISBN 978-3-900734-07-7.
    By the International Lighting Vocabulary, the definition of light is: “Any radiation capable of causing a visual sensation directly.”
  2. Gregory Hallock Smith (2006), Camera lenses: from box camera to digital, SPIE Press, p. 4, ISBN 9780819460936
  3. Narinder Kumar (2008), Comprehensive Physics XII, Laxmi Publications, p. 1416, ISBN 9788170085928

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