Lec23-4

# Lec23-4 - Lecture 23-1 Review Laws of Reflection and...

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Lecture 23-1 Review: Laws of Reflection and Refraction Law of Reflection A reflected ray lies in the plane of incidence The angle of reflection is equal to the angle of incidence 11 θθ = Law of refraction A refracted ray lies in the plane of incidence The angle of refraction is related to the angle of incidence by 2 21 1 sin sin nn = Snell’s Law Medium 1 Medium 2 ∴> /1 i i i i cn c ff n n λ = = = Where λ is the wavelength in vacuum

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Lecture 23-2 Total Internal Reflection In general, if sin θ 1 > ( n 2 / n 1 ), we have NO refracted ray; we have TOTAL INTERNAL REFLECTION . All light can be reflected, none refracting, when light travels from a medium of higher to lower indices of refraction. e.g., glass (n=1.5) to air (n=1.0) 1 sin 2 1 1 2 > = n n θ 21 θθ > But θ 2 cannot be greater than 90 O ! ( ) 1 sin / c nn Critical angle above which this occurs. medium 2 medium 1
Lecture 23-3 Demo 7A-23 Total Internal Reflection

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Lecture 23-4 Examples 1 1 sin 48.8 1.33 c θ  =   Fish’s view of the world Prism used as reflectors Optical fiber 1 1.33 sin 62.5 1.5 c = in water 1 1 sin 41.8 1.5 c = in air (e.g., glass with n=1.5) 1 1 sin 41.8 1.5 c = (e.g., glass with n=1.5)
Lecture 23-5 ©2008 by W.H. Freeman and Company

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Lecture 23-6 ©2008 by W.H. Freeman and Company
Lecture 23-7 Reading Quiz 1 Which of the following statements is incorrect? A| When light interacts with matter the change in energy is governed by its particle properties. B| The propagation of light is governed by its wave properties. C| Wave particle duality (particle properties and wave properties coexist) is not a general property of nature. D| The photon is a particle of light whose energy is E = hf, where h is plancks constant and f is the frequency of the photon.

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Lecture 23-8 Chromatic Dispersion The index of refraction of a medium is usually a function of the wavelength of the light. It is
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Lec23-4 - Lecture 23-1 Review Laws of Reflection and...

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