Sources of Light. Luminous Body – An object that emits light waves.

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Presentation transcript:

Sources of Light

Luminous Body – An object that emits light waves.

Illuminated body – an object that reflects light

Types of Reflection Specular (Regular) Reflection Diffuse (Irregular) Reflection The angle in which the light strikes the surface of a material with respect to the normal is the same angle it leaves the material.

Speed of Light

Danish Astronomer Ole Roemer ( ) was the first to determine that the speed of light is finite. Sun Jupiter Sun Earth Io Earth Io Jupiter

Albert Michelson ( ) was the first Physicist to accurately determine the speed of light. d=35 km θ v=2πr/T=2πrf v=θ/t  t=θ/v r v=2d/t

The speed of light was determined by Michelson to be ±.00004x10 8 m/s The speed of light is now accepted as x10 8 m/s in a vacuum. 3.00x10 8 m/s can be used for calculations. c=3.00x10 8 m/s The speed of light is considered as the speed limit for matter in the universe. v=fλ  c=fλ

Speed of Light in a Medium c=nv c=3.00x10 8 m/s in a vacuum. c=the speed of light in a vacuum n: index of refraction (optical density) of the medium v: speed of light in the medium Index of refraction: The ratio of the speed of light in a vacuum to a medium. The index of refraction is a relative measure of how much light bends in traveling from one medium to another. The index of refraction, n ranges from 1.00 in a vacuum to 2.42 (higher index of refraction values are possible) Index of refraction value examples: 1.00 vacuum, air (1.00), 1.33 water, 1.34 ice, 1.52 crown glass, 1.54 flint glass, 2.30 cubic zirconia, 2.42 diamond. The larger the index of refraction, the slower light travels in that medium.