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Chapter 1: Nature of light. Wave-particle duality. E = h n. particle. wave. However strange, it correctly describes known phenomena connected with light. Optics: the study of light. Geometrical (ray) optics macroscopic-scale phenomena -light travels in straight lines (rays)

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## Chapter 1: Nature of light

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**Wave-particle duality**E = hn particle wave However strange, it correctly describes known phenomena connected with light.**Optics: the study of light**Geometrical (ray) optics macroscopic-scale phenomena -light travels in straight lines (rays) -wavelength l 0, frequency n ∞ -explains reflection and refraction -useful for designing imaging systems Physical (wave) optics microscopic-scale phenomena -light (electromagnetic radiation) is a wave -action of light described by Maxwell’s equations -explains reflection, refraction, dispersion, interference, polarization, diffraction Quantum optics atomic-scale phenomena -light is a photon; has both wave-like and particle-like characteristics -used to analyze light-matter interactions -explains photoelectric effect, lasers Quantum optics Physical optics Ray optics**The electromagnetic spectrum**light is identified as an electromagnetic wave with a frequency detected by the human eye c = 3 x 108 m/s**Radiometric quantities**characterizing the energy content of electromagnetic radiation**differential solid angle dw for describing radiant**intensity: A steradian corresponds to an area of a sphere equal to r2. The irradiance decreases inversely with the square of the distance. inverse square law for characterizing irradiance:**Exercises**You are encouraged to solve all problems in the textbook (Pedrotti3). The following may be covered in the werkcollege on 7 September 2010: Chapter 1 2, 10, 17

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