Nature of Light and Laws of Geometric Optics

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Nature of Light and Laws of Geometric Optics - PowerPoint PPT Presentation

Nature of Light and Laws of Geometric Optics. The nature of light Reflection Refraction Index of refraction Huygens’ Principle Dispersion and Prisms Total Internal Reflection. The Nature of Light. Light as Particles Tactile Theory (Ancient Greeks) Emission Theory (al-Haitham) Newton

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Nature of Light and Laws of Geometric Optics

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Presentation Transcript
Nature of Light and Laws of Geometric Optics
• The nature of light
• Reflection
• Refraction
• Index of refraction
• Huygens’ Principle
• Dispersion and Prisms
• Total Internal Reflection
The Nature of Light
• Light as Particles
• Tactile Theory (Ancient Greeks)
• Emission Theory (al-Haitham)
• Newton
• Light as Waves
• Huygens
• Maxwell
• Quantum Theory
• Photons
Reflection

Specular Reflection

Diffuse Reflection

Concept Question

Suppose the sprinters wish to get from point Q on the beach to point P on the parking lot as quickly as possible. Which path takes the least time?

• a
• b
• c
• d
• e
• All paths take the same amount of time.
Index of Refraction

Going from one medium to another, the frequency of light does not change but its wavelength does.

If one of the medium’s is vacuum (n=1),

Snell’s Law of Refraction

Announcements
• Cell phones on silent.
• Fermat’s principle: nothing quantitative– just understand the idea of minimum time.
Dispersion and Prisms

angle of deviation

Total Internal Reflection

Critical Angle, qc

Only for n1 > n2

View From a Fish Eye

For q<qc: The fish sees above the water

For q=qc : The fish sees the shoreline

For q>qc : The fish sees the pond bottom

Applications of TIR

Retroreflector

Periscope

Fiber Optic Cable