light
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Light. A Dozen Facts About Light. Light Fact 1:. Light is a form of energy (energy is the ability to make things change),. Fact 2: it travels in a wave OR? In a particle form called a “photon,” which is a bundle of energy. Fact 3: Light travels in a straight line - PowerPoint PPT PresentationTRANSCRIPT
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Light
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A Dozen Facts About Light
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Light Fact 1:Light is a form of energy(energy is the ability to make things change),
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Fact 2: it travels in a wave
OR?In a particle form called a “photon,” which is a bundle of energy.
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Fact 3: Light travels in a straight line and Fact 4: obeys the Law of Reflection
Angle of incidence = Angle of reflection
In other words, light gets reflected from a surface at ____ _____ angle it hits it.
The same !!!
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When not reflected…
What ever cannot be reflected is absorbed.• This makes objects appear black• This makes objects get hot–What are some examples?
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Fact 5: Light not only reflects, but also refracts(Refracts: when energy bends as it passes through something)
Why?
Light passing through a block of ice
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Fact 6: Light is fast.Speed of light is 300,000,000 m/secSpeed of sound is only 340 m/sec
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At this speed it can go around the world 8 times in one second.
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• ShadowsFact 7: Shadows are places where light is blocked, absorbed and reflected, by something in the way
Rays of light
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Fact 8: Color is determined by wavelength
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Fact 9: Visible light is part of the electromagnetic spectrum
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• Fact 10: When you see a color, the object has absorbed all of the other colors of the rainbow
• Fact 11: The three primary (or addititive) colors of light are red, green, blue
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These are also the three types of cone cells in the eye
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Projected light is red, green, and blue
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Fact 12: the subtractive colors (in pigment molecules) are yellow, cyan, and magenta
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For example…expand the man
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Quick Quiz
1. True or False: Light is slower than sound.2. When waves bounce off of something it is
called _____________?3. The additive colors of light are _________,
__________, and ___________.4. When light is ___________ it converts from
light energy to heat.
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Is this possible?
• Lightsaber• Blaster• Battle of Naboo