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"Linear Propagation of Light" PPT teaching courseware on light phenomena
Part One Content: Basic Knowledge Key Points
Knowledge point 1 Light source
1. Among the objects shown in the figure, the light source is (B)
Knowledge point 2: Straight line propagation of light
2. Which of the following phrases or idioms involves knowledge that has nothing to do with the straight-line propagation of light (B)
A. Instant results B. Fishing for the moon in the water
C. Three points and one line D. One leaf blinds the eye
3. Which of the following statements is correct (C)
A.Light travels in straight lines under any circumstances
B. Light does not propagate in a straight line in uniform glass
C. Light travels in straight lines in uniform water
D. Light travels in straight lines only in air
Knowledge point 3: The propagation speed of light
4. The propagation speed of light in vacuum is 3×108m/s. In order to realize our country’s lunar exploration plan, it takes about 2.6 s for the laser fired to the moon to reach the moon and return to the ground. Then the distance between the earth and the moon is 3.9× 108m.
PPT on linear propagation of light, part 2: improvement of comprehensive capabilities
5. On July 28, 2018, the longest total lunar eclipse of this century occurred. During a total lunar eclipse, the moon turns a spectacular red color, commonly known as a "blood moon." The "blood moon" we see is not a (optional "yes" or "no") light source. The phenomenon of total lunar eclipse is caused by light propagating in straight lines in the same homogeneous medium. When light propagates in the three media of glass, air, and water, the propagation speed in air is the largest.
6. It takes 8 minutes for the light from the sun to reach the earth. The distance from the sun to the earth is about 1.44×1011 m. The speed of light is much greater than the speed of sound. It is known that the propagation speed of sound in the air at 15°C is 340 m/s. , if someone hears thunder 4 seconds after seeing lightning, then the lightning cloud is about 1360 m away from the person.
7. On a sunny day, when walking on a tree-lined street, you often see some circular light spots on the ground as shown in the picture. The reason for these light spots is that the light propagates along a straight line and forms an image on the ground. Observe carefully. , and found that the diameters of these circular light spots are not the same. The different diameters of the light spots are mainly caused by the different distances between the leaves and the ground.
8. Xiao Ming learned from reading the textbook that the small holes will be upside down and left and right. In order to verify this statement, he planned to make several luminous characters for experiments. The most suitable one is D (fill in the letter).
9. Xiao Ming did a small hole imaging experiment using the device as shown in the picture outside class. There is a small triangular hole at the bottom of the can, then the following statement is correct (A)
A. What he saw on the translucent paper was the image of an upside-down candle.
B. What he saw on the translucent paper was a triangular light spot
C. What he saw on the translucent paper was the image of a candle standing upright.
D. In order to make the image on the translucent paper clearer, the experiment should be conducted in a brighter environment.
10. Since light propagates in a straight line, the shadow of an object will be seen under the light, and astronomical phenomena such as solar eclipses will occur in nature. Lasers can be used to guide the tunnel boring machine forward. If light does not propagate along a straight line in the same uniform medium, the following phenomena may occur: (B)
A. The figures in the sunlight are clearer B. There is no distinction between day and night on the earth
C. It is easier to line up the team when doing exercises D. It is easier to form solar and lunar eclipses
PPT on linear propagation of light, part 3: Expansion of research and breakthroughs
17. After learning about optics, Xiaotong and Xiaoduo, who love to use their brains, want to explore the phenomenon of pinhole imaging by themselves. As shown in the picture, they punched a round hole and a square hole in the center of the bottom of two empty cans, and then used two pieces of translucent plastic film to cover the mouths of the empty cans. Place the small hole against the candle and the filament respectively, and you can see the image formed by the candle and the filament passing through the small hole.
(1) In order to observe the image more clearly, a brighter (optional "darker" or "brighter") object is usually selected as the observation object;
(2) By analyzing and comparing pictures A and B, we can conclude that the image formed by an object passing through a small hole has nothing to do with the shape of the small hole;
(3) By analyzing and comparing pictures A and C, we can conclude that the image formed by an object passing through a small hole is related to the shape of the object;
(4) Xiaotong observes the " " shaped moon with the help of experimental device A, then the shape of the image she sees on the translucent light screen is C.
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For more information about the PPT courseware "Light Phenomena: Linear Propagation of Light", please click on the "Light Phenomena ppt: Linear Propagation of Light" ppt tag.
"Linear Propagation of Light" PPT courseware download of light phenomena:
"Linear Propagation of Light" PPT courseware download on light phenomena Part 1: Classification practice of knowledge points Knowledge point 1 Light source 1. Please divide the following objects into two categories according to certain standards. Lighted candles, sun, moon, glowing fireflies, eyes, batteries. (1..
"Linear Propagation of Light" PPT download of light phenomena:
"Linear Propagation of Light" Light Phenomenon PPT Download Part One: New Knowledge Summary 1 Light Source 1. Definition: An object that can ______ is called a light source. 2. Classification: Light sources are classified according to their sources and can be divided into ______ light sources and ______ light sources. 2. Straight line propagation of light 1..
"Linear Propagation of Light" Light Phenomenon PPT:
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