Laser Tracking on the CD Scaled Views of a Compact Disc
Laser Tracking on the CD Scaled Views of a Compact Disc
Laser Tracking on the CD Scaled Views of a Compact Disc
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amplitude for <strong>the</strong> light polarized parallel to <strong>the</strong> incident plane is zero for a specific angle called <strong>the</strong><br />
Brewster angle. The reflected light is <strong>the</strong>n linearly polarized in a plane perpendicular to <strong>the</strong> incident<br />
plane. This polarizati<strong>on</strong> by reflecti<strong>on</strong> is exploited in numerous optical devices. Ano<strong>the</strong>r<br />
characteristic <strong>of</strong> internal reflecti<strong>on</strong> is that <strong>the</strong>re is always an angle <strong>of</strong> incidence c above which all<br />
light is reflected back into <strong>the</strong> medium. This phenomen<strong>on</strong> <strong>of</strong> total internal reflecti<strong>on</strong> has many<br />
practical applicati<strong>on</strong>s in optics.<br />
Reflecti<strong>on</strong> and Transmissi<strong>on</strong><br />
External Reflecti<strong>on</strong><br />
Fresnel's equati<strong>on</strong>s describe <strong>the</strong> reflecti<strong>on</strong> and transmissi<strong>on</strong> <strong>of</strong> electromagnetic waves at an<br />
interface. That is, <strong>the</strong>y give <strong>the</strong> reflecti<strong>on</strong> and transmissi<strong>on</strong> coefficients for waves parallel and<br />
perpendicular to <strong>the</strong> plane <strong>of</strong> incidence. For a dielectric medium where Snell's Law can be used to<br />
relate <strong>the</strong> incident and transmitted angles, Fresnel's Equati<strong>on</strong>s can be stated in terms <strong>of</strong> <strong>the</strong> angles <strong>of</strong><br />
incidence and transmissi<strong>on</strong>.