PHY132_L27 - Classical Physics II Classical Physics II...

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lassical Physics II Classical Physics II PHY132 Lecture 27 Mirrors and Glass: Reflection and Refraction … Lecture 27 1 04/12/2010
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Electromagnetic Spectrum Frequency and wavelength: f λ = c The visible part of the EM spectrum is only small, from 00 nm 00 nm 400 nm < λ < 800 nm – different wavelengths are seen as different COLORS –f rom sho r t λ to long: violet , blue , green , yellow , orange , red larger λ (lower f ): – INFRARED, followed by –M I C ROWA V E S : 0.1 mm < λ < 1 m , –RAD IOWA V E S : λ > 1m: HF VHF MW LW VLF UHF, VHF, MW, LW, VLF, … shorter λ (higher f ): – ULTRAVIOLET: 1 nm < λ < 400 nm , OFT/HARD X AY: pm nm and Lecture 27 2 SOFT/HARD X-RAY: 1 pm < λ < 1 nm , and – GAMMA: λ < 1 pm , where instead of wavelength one usually uses photon energy to denote the radiation 04/12/2010
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Geometric / Ray Optics much older than the discovery of the wave nature of light. empirical facts: etween a source and a receiver light moves along straight lines between a source and a receiver light moves along straight lines (“rays”) in a given uniform material – at interfaces (reflective, refractive) the direction of the ray hanges in predictably: changes in predictably: angles: measured w.r.t. the normal n to the surface of reflection or to the interface of refraction icture: picture: – the incident ray, the outgoing ray (reflected or refracted), and the normal to the surface/interface all lie in the same plane or E RACT ON: Lecture 27 3 – for RE FRACT ION: n inc sin θ inc = n refr sin θ refr –for RE FLECT ION: n inc = n refl θ inc = θ refl 04/12/2010
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Ray Optics and EM Waves Because the propagation direction is E and B , the propagation is in straight lines, until an conductive, dielectric, or magnetic surface is met… • at a conductive surface, the changing electric and
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This note was uploaded on 04/14/2010 for the course PHY 132 taught by Professor Rijssenbeek during the Spring '04 term at SUNY Stony Brook.

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PHY132_L27 - Classical Physics II Classical Physics II...

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