chap 6 optical properties - Chapter 6 Optical Properties...

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Chapter 6: Optical Properties and Superconductive Materials
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1.Visible light is one form of electromagnetic radiation, wavelengths from 0.4- 0.75 m. 2. Visible light contains color bands range from violet through red (as fig 1). 3. Ultraviolet region cover range from 0.01-0.4 m, while infrared region from 0.75-1000 m. Light and electromagnetic spectrum
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1 . Light has the form of waves and to consist of particles called photons. 2. Photons have the fundamental equation: h :Planck'sconstant(6.62x10-34J.s); c:the speed of light in vacuum (3.00x108m/s); :wavelength v:frequency 3.These equations allow us to consider the photon as a tide of energy, E or as a wave with a specific wavelength and frequency.
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1. When light photons are transmitted through a transparent material, they lose some of their energy, and as a result, the speed of light is reduced and the beam of light changes direction. 2. Fig 2 show how a beam of light entering from air is slowed when entering a denser medium such as window glass. 3. Thus, the incident angle for the light beam is greater than refracted angle in this case Refraction of light: index of refraction Fig 2: Refraction of light beam as it is transmitted from a vacuum (air) through soda-lime-silica glass.
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The relative velocity of light passing through a medium is expressed by the optical property called the index of refraction n. The n value of a medium is defined as the ratio of the velocity of light in vacuum, c, to the velocity of light in the medium considered, u.
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1. The highly refractive diamond(n=2.41) allow multifaceted
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