Ch 15.1 - Refraction Definition: Refraction Change in speed of light as it moves from one medium to...
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Transcript of Ch 15.1 - Refraction Definition: Refraction Change in speed of light as it moves from one medium to...
![Page 1: Ch 15.1 - Refraction Definition: Refraction Change in speed of light as it moves from one medium to another. Can cause bending of the light at the interface.](https://reader030.fdocuments.net/reader030/viewer/2022033106/56649f335503460f94c501b2/html5/thumbnails/1.jpg)
Ch 15.1 - RefractionCh 15.1 - Refraction
![Page 2: Ch 15.1 - Refraction Definition: Refraction Change in speed of light as it moves from one medium to another. Can cause bending of the light at the interface.](https://reader030.fdocuments.net/reader030/viewer/2022033106/56649f335503460f94c501b2/html5/thumbnails/2.jpg)
Definition: RefractionDefinition: Refraction
Change in speed of light as it moves from one medium to another.
Can cause bending of the light at the interface between media.
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Index of RefractionIndex of Refraction
• The ratio of the speed of light in a vacuum to its speed in a given transparent medium
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Index of RefractionIndex of Refraction
speed of light in vacuum
speed of light in medium
n = c/v
n =
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Snell’s LawSnell’s Law
n1
n2
1
angle of incidence
2
angle of refraction
n1sin 1 = n2sin 2
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nn11 < n < n22
n1
n2
1
2
light bends toward normal
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nn11 > n > n22
n1n2
1
2
light bends away from normal
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HomeworkHomework
• P567 #1-3 (Snell’s Law)
• P567 #1-3 (Section Review)
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15.3 – Optical Phenomena15.3 – Optical Phenomena
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DispersionDispersion
The separation of white light into colors due to different refractive indices for different wavelengths.
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DispersionDispersionDue to different indices of refraction for different wavelengths of light.
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Useful DefinitionsUseful Definitions
• Total Internal Reflection – the complete reflection of light at the boundary of two transparent media
• Critical Angle – the minimum angle of incidence for which total internal reflection occurs
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Critical Angle of IncidenceCritical Angle of Incidence
n1
n2
c
Light would refract 90o so it reflects instead, undergoing total internal reflection.
r
n1 > n2
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Calculating Critical AngleCalculating Critical Angle
n1sin(1) = n2sin(2)
n1sin(1) = n2sin(90o)
n2 = n1sin(c)
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Total Internal ReflectionTotal Internal Reflection
n1
n2
i r
Occurs only when angle of incidence > critical angle
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HomeworkHomework
• P582 #1-4, p585 #1-3
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15.2 – Thin lenses15.2 – Thin lenses
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Lens typesLens types
• Converging – can produce real or virtual images
• Diverging – can produce only virtual images
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Ray diagramsRay diagrams
• Same rays as we drew for mirrors
• Rays will always go through the mirror (not reflected) but will be somehow bent (refracted)
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Useful DefinitionsUseful Definitions
• Lens – a transparent object that refracts light rays, causing them to converge or diverge to create an image.
• **Big difference with mirrors**– Real is on the right side of the lens. Why?
• + side of mirror is ride side
• - side of mirror is left side
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Converging lens #1Converging lens #1
C F
Real, Inverted, Reduced Image
F2F 2F
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Converging lens #2Converging lens #2
C F
Real, Inverted, True (Same size) Image
F2F 2F
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Converging lens #3Converging lens #3
C F
Real, Inverted, Enlarged Image
F2F
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Converging lens #4Converging lens #4
C F
Virtual, Upright, Enlarged Image
F
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For converging lensesFor converging lenses
• f is positive• p is positive• q is positive for real images and negative for
virtual images• M is negative for real images and positive for
virtual images • hi is negative for real images and positive for
virtual images
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Diverging lensDiverging lens
C F
Virtual, Upright, Reduced Image
F
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For diverging lensesFor diverging lenses• f is negative• p is positive• q is negative• M is positive and < 1• hi is positive and < ho
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HomeworkHomework
• P576 #1-4