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Reflection Lab
What is the relationship between the angle in and the angle out for light on a mirror?
Reflection Lab
Consensus:
The angle of incidence = the angle of reflection
New Terms:
Normal – the imaginary line perpendicular to the mirror.
Angle of incidence – angle between the light beam and the normal.
Angle of reflection – angle between the reflected beam and the normal.
ReflectionWhen waves bounce off a surface.
When light bounces off an opaque object.
Two types of reflection:
Regular Diffuse
ReflectionRegular reflection
Diffuse reflection
ReflectionAnatomy of a ray
Law of ReflectionThe angle of incidence equals the angle of reflection
Law of Reflection
For plane mirrors:
object distance = image distance
Law of Reflection
Law of Reflection
Law of Reflection
Law of Reflection
Law of Reflection
Law of Reflection
Law of Reflection
Law of Reflection
Law of Reflection
Law of Reflection
Law of Reflection
Law of Reflection
ABE BEV CIS DON EVA FLO GUY HAN
Abe can see: Eva, Flo, Guy and Han
Law of Reflection
ABE BEV CIS DON EVA FLO GUY HAN
Bev can see: Don, Eva, Flo, Guy and Han
Law of Reflection
ABE BEV CIS DON EVA FLO GUY HAN
Cis can see: Himself, Don Eva, Flo, Guy and Han
Law of Reflection
ABE BEV CIS DON EVA FLO GUY HAN
Don can see: Bev, Cis, Himself, Eva, Flo, Guy and Han
Law of Reflection
ABE BEV CIS DON EVA FLO GUY HAN
Eva can see: Abe, Bev, Cis, Don and Herself
Law of Reflection
ABE BEV CIS DON EVA FLO GUY HAN
Flo can see Abe, Bev, Cis, Don and Eva
Law of Reflection
ABE BEV CIS DON EVA FLO GUY HAN
Guy can see: Abe, Bev, Cis and Don
Law of Reflection
ABE BEV CIS DON EVA FLO GUY HAN
Han can see: Abe, Bev, and Cis
Law of Reflection
Law of Reflection
Refraction Lab
What is the relationship between the angle in and the angle out of light through a transparent solid?
Refraction Lab
Consensus:
As light travels into an optically dense object, it bends toward the normal.
New Terms:
Refraction – the change of direction of light as it passes through a substance.
RefractionWhen light passes through a transparent
material.
In a vacuum, light travels at 3 X 108 m/s, but since it is a wave, it travels at different speeds through different media.
Unlike sound, the more dense an object, the slower light travels.
RefractionBecause light slows down it is bent in a
different direction. This is refraction.
Refraction
Law of RefractionAs light travels from a
less dense medium into a more dense medium, the angle gets closer to the normal
As light travels from a more dense medium into a less dense medium, the angle gets farther away from the normal.
Law of Refraction
Law of Refraction
Law of Refraction
Law of Refraction
Law of Refraction
Law of Refraction
Law of Refraction
Law of Refraction
Law of Refraction
Law of Refraction
Law of Refraction
Law of Refraction
Law of Refraction
Law of Refraction
Atmospheric RefractionOn very hot days, the air near the ground is
warmer than the air above it. Since particles in warmer air are farther apart, light travels faster, causing refraction.
Atmospheric RefractionYou can actually see the sun after it has dropped
below the horizon for several minutes because the light is refracted by the earth’s atmosphere. The same thing occurs at sunrise.
Atmospheric Refraction
RainbowsOccur when light from the sun is dispersed by
water droplets in clouds, or falling rain drops.
RainbowsRainbows are actually circles. You can clearly
tell from above. We would see them as circles as well, except that the ground gets in the way!
Total Internal ReflectionOccurs when light
rays are at such an angle to the boundary between two different media that it “can’t escape” and is instead reflected.
Total Internal Reflection
Total Internal Reflection
Total Internal Reflection
This is the science
that led to fiber optics.
Law of Refraction
Law of Refraction
Law of Refraction
Law of Refraction
Law of Refraction
Law of Refraction
Law of Refraction
Law of Refraction
