warm up 1.what kind of electromagnetic radiation has a wavelength of 3.0 m? what is its frequency?...
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Warm Up
1. What kind of electromagnetic radiation has a wavelength of 3.0 m? What is its frequency?
2. What is the wavelength of light that has a frequency of 5.88x1014 Hz? What color is it?
3. What are the primary colors by addition? Subtraction?
4. What is the difference between color by addition and color by subtraction?
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Reflection
• Reflection occurs when a wave strikes an object and bounces off of it
Mirror
Light
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Reflection
• Reflection occurs when a wave strikes an object and bounces off of it
Mirror
Light
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The angle of reflection must equal the angle of incidence
LAW OF REFLECTION
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• The law of reflection says that light reflects (bounces) off of an object at the same angle at which the light hits it.
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Examples of Reflection
• Light bounces off a mirror
• Bats use echolocation (sound waves bounce off of other objects)
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REFLECTION EXAMPLE #2
Tinted windows on a car
•Tinted windows make it cooler inside cars by reflecting light away from the window.
• Reflection keeps heat out!• What wave carries heat that we
learned about from the EM spectrum?
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Mirror
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Mirror
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Mirror
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Two Types of Reflection
Flat surfaces reflect perfectly!
Rough surfaces reflect all over the place!
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Refraction
• Refraction is the bending of a wave caused by the change in its speed as it moves from one medium to another
– What are some mediums that waves travel through?
– Does light need a medium to travel?
Liquids, Air, Solids
NO! It can travel through SPACE!
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New Vocabulary
• Opaque- not able to be seen through
• Transparent- see through
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When does it reflect/refract?• If an object is opaque, the light will reflect
because light cannot pass through a solid object.– Mirror– A book
• If an object is transparent, the light will refract because light can pass through the object.– Water– Prism
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Refraction of Light in Water
• Light travels faster in air than in water– (water is more dense than the air…same goes for
glass or any other medium more dense than air)
• Because of this difference in speed, refraction causes underwater objects to appear closer to the surface than they really are
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Refraction (Slowing Down)
• When a wave passes into a medium that makes it slow down, the wave will bend toward the normal
Air
Water
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Refraction (Slowing Down)
• When a wave passes into a medium that makes it slow down, the wave will bend toward the normal
Air
Water
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Refraction (Speeding Up)
• When a wave passes into a medium that makes it speed up, the wave will away from the normal
Air
Water
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Refraction (Speeding Up)
• When a wave passes into a medium that makes it speed up, the wave will away from the normal
Air
Water