Reflection and Refraction Chapter 17. Law of Reflection θiθi θrθr θ i angle of incidence θ i...
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Transcript of Reflection and Refraction Chapter 17. Law of Reflection θiθi θrθr θ i angle of incidence θ i...
![Page 1: Reflection and Refraction Chapter 17. Law of Reflection θiθi θrθr θ i angle of incidence θ i angle of reflection.](https://reader035.fdocuments.net/reader035/viewer/2022062322/5697bf911a28abf838c8eae9/html5/thumbnails/1.jpg)
Reflection and Refraction
Chapter 17
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Law of Reflection
θi θr
θi angle of incidence
θi angle of reflection
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Law of Reflection
θi θr
θi = θr
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Types of Reflection
Regular Diffuse
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Refraction of Light
θr
θi
θi
θr
Air(ni)
Glass(nr)
ni< nr
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Index of Refraction n(Optical Density)
Air: ni
Glass: nr
ni< nr
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Refraction of Light
θr
θini
nr
ni < nr
ninrθr
θi
ni > nr
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Snell’s Law
θr
θini
nr
ni sin θi = nr sin θr
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A ray of light has an angle of incidence of 25.0upon the surface of a piece of quartz. What is the angle of refraction?θi
θr
Air: ni = 1.00
Quartz: nr = 1.54
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Given: ni = 1.00 nr = 1.54 θi = 25°
Find: θr
Equation: nisin θi = nrsin θr
sin-1(sin θi /nr )= θr
sin-1(sin 25° /1.54)= θr
θr = 17 °
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Speed of Light andThe Index of Refraction
nn = c v
n: index of refractionc: speed of light in a vacuumv: speed of light in material
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What is the speed of light in diamond?
Given: nD = 2.42 c = 3.0 X 108m/s
Equation: vD = c/nD vD = 3.0 X 108m/s / 2.42
vD = 1.2 X 108m/s
Find: vD
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Total Internal Reflection
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Total Internal Reflection
n1
n2
n2 > n1
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Total Internal Reflection
n1
n2
n2 > n1
Critical Angle
90º
θc
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Total Internal Reflection
ni sin θi = nr sin θr
ni sin θc = nr sin 90º
ni sin θc = nr (1)
sin θc = ni
nr
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Total Internal Reflection
θc = sin-1 ni
nr
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Example: What is the critical angle between water and air?
Given: nw = 1.33 na = 1.00
Given: θc = sin-1 ni
nr
θc = sin-1 1.331.00
θc = 49°
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Mirage
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Diamonds (n = 2.42)
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Fiber Optics
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Dispersion cause by Refraction
Prism
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PrismThe amount that light is diffracted depends on its wavelength. Shorter
wavelengths are bent more than longer wavelengths. Violet is
bent more than Red!!!
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Rainbow
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Spectroscopy
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