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Authoritative PPT Summary
"Light and Color" Wonderful light PPT courseware
Talk about it
Objects that shine in life?
Light source: an object that is emitting light
Common light sources in life: the sun, fireflies, bonfires and torches, oil lamps, burning candles, electric lamps, lasers
propagation of light
Light energy spreads in air, water, glass and other substances → transparent substances
Note: Light is a straight line with an arrow drawn by people to visually represent the straight-line propagation of light. It is a method of expressing the propagation of light, but it does not actually exist.
Applications of linear propagation of light:
shadow formation
The formation of lunar and solar eclipses
Rifle aiming
think
When aiming and shooting with a rifle, when the eye sees that the aiming point, the front sight tip and the notch coincide, it is considered that the three are in the same straight line. What is the reason for this?
Light propagates along straight lines in the same homogeneous material.
The basics when shooting and aiming are:
Close your left eye, open your right eye, look at the crosshair through the gap, and align the three points on the target.
discuss:
When you usually form a team, you need to line up the team in an orderly manner. What method do you use to judge whether the team is arranged in an orderly manner?
speed of light
The speed of light propagating in different materials is different. The speed of light propagating in vacuum is the fastest, which is 3×105 kilometers/second.
The propagation speed of light in water is ¾ of that in vacuum. What is the propagation speed of light in water?
2.25×105 kilometers/second
A light year is the distance that light travels in a year. It is a unit of length, not time, and is equal to 9.46×1012 kilometers.
Explore:
How are the circular spots in the shade of trees formed under sunlight?
The properties of small hole imaging: inverted, real image, which can be enlarged, equal-sized or reduced.
The shape of the image has nothing to do with the shape of the hole. The size of the image is related to the distance between the light screen and the hole.
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"Light and Color" Wonderful Light PPT Courseware 2:
"Light and Color" Wonderful Light PPT Courseware 2 Question: Why can you see the text in the book? (Because light enters people's eyes) Please close your eyes. Can you still see these pictures? Can't Why? Light does not enter our eyes. us..