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Файл:Lectures Physics 2 / 2-1.ppt
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- •Course of lectures «Contemporary
- •Optics
- •Literature
- •Scale of
- •Optics at present time
- •Optics in techniques, medicine and bioilogy
- •Optics phenomenon in nature
- •Пифагор
- •Эвклид (III в. до н. э.)
- •Галилео Галилей (1564 - 1642)
- •Thelaws of ancient optics 1
- •Thelaws of ancient optics 3
- •The laws of ancient optics 4
- •-The rays coming from the eyes, apply a straight line and diverge to
- •-Objects that are visible at large angles, seem more apparent, at smaller angles
- •-All the beams have the same speed.
- •The Nature of Light
- •Measurements of the Speed of Light
- •Measurements of the Speed of Light
- •The Ray Approximation in Geometric Optics
- •The Ray Approximation in Geometric Optics
- •Reflection
- •Reflection
- •Reflection
- •Reflection
- •Reflection
- •Reflection
- •Reflection
- •Reflection
- •Reflection
- •Huygens’s Principle
- •Huygens’s Principle
- •Huygens’s Principle
- •Dispersion and Prisms
- •Dispersion and Prisms
- •Total Internal Reflection
- •Total Internal Reflection
- •Fermat’s Principle
Total Internal Reflection
(1.9)
Total Internal Reflection
Optical Fibers
Light travels in a curved transparent rod by multiple internal reflections.
The construction of an optical fiber. Light travels in the core, which is surrounded by a cladding and a protective jacket.
Fermat’s Principle
Fermat’s principle states that when a light ray travels between any two points, its path is the one that requires the smallest time interval.