light rays
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Light RaysTRANSCRIPT
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Light Rays
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Luminous and Non LuminousLuminous Sources:
Emits its own lightExample-
Living things: fireflies and glow-worms
Non-living things: Sun, lighted candle ,electric lamp
Sources of LightTwo types:
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Radiate light when their atoms are excited by some source
of energy.
Example: A torch shines as a result of the chemicalenergy stored in the batteries.
Non-Luminous Sources:Reflects light from a luminous sourceExample: Moon ,table ,pen
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Light Amplification byStimulatedEmission of
Radiation
Emits a narrow, strong and concentrated bright
beam of light due to the excitation of the atoms.
Applications:Medical Field- operations on eye and ear
CD players
Surveying and Ranging
Barcode Scanners
Welding and Cutting
Fibre optic communication
Laser Printing
LASER
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Rays and BeamsRay: Direction along which light energy travels.
Beam: Stream of light.Collection of rays.
Classification of Beams:
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Reasons for formation of shadows:
i. Opaque objects -do not allow light to pass throughthem
ii. Straight line property of light
Shadows
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Parts of Shadow :Umbra: Innermost and darkest part of a shadow
Penumbra: Ring of partial shadow
Sharpness of shadow depends on size of light
sources .
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Source Types :
A. point source: Shadow with Umbra only
B. extended source: Shadow with Umbra and Penumbra.
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What type of source is this ????
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Speed of Light