"End of Chapter Review" Light Phenomenon PPT

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"End of Chapter Review" Light Phenomenon PPT

Part One: Breakthrough of Core Points

1. Straight line propagation of light

1. Light source: Objects that can ______ are called light sources, such as the sun, lit candles, and glowing fireflies. The moon _____ (optional "yes" or "no") light source.

2. Straight line propagation of light: Light travels along _____ in a ________ medium. The formation of small holes, the formation of shadows, and the formation of solar and lunar eclipses can all illustrate the law of linear propagation of light. If the medium is different or the medium is not uniform, the path of light may change or bend. Shooting aiming, laser collimation, etc. all apply the _________ law of light.

2. Reflection of light

5. Reflection of light: When light is emitted from one medium to the interface of another medium, part of the light ____________ changes the propagation direction of the light. This phenomenon is called reflection of light; we can see that it does not emit light. object because the object _________enters our eyes.

6. law of reflection of light

(1) The reflected ray, incident ray and normal line are within ________.

(2) The reflected ray and incident ray are respectively located on the normal line _____.

(3) Reflection angle _____ incident angle.

(4) In the phenomenon of reflection, the light path is _____.

7. Specular reflection and diffuse reflection: The reflection of light can be divided into _____ reflection and ____ reflection.

3. Plane mirror imaging

8. Imaging characteristics of plane mirror

(1) The size of images and objects _____.

(2) _________ from image and object to mirror surface.

(3) The connection between images and objects__________.

(4) The image formed by an object in a plane mirror is _____.

9. Convex mirrors and concave mirrors: Convex mirrors have a _____ effect on light. Car rearview mirrors and intersection reflectors are all ___ mirrors; concave mirrors have a _____ effect on light and can be made using concave mirrors. Solar cooker.

10. Real image and virtual image: The real image is formed by the convergence of ________, which can be seen by the eyes and can also be presented on the light screen; the virtual image is not formed by the convergence of actual light rays, but is formed by the intersection of __________ of actual light rays. It can only be seen with the eyes and cannot be displayed on a light screen.

11． Application of plane mirror: Combined with Figure 4-F-1, illustrate the application of plane mirror in life and production: ①_____; ②_______________.

4. Refraction of light

12. refraction of light

(1) Definition: When light _____ from one transparent medium to another transparent medium, the propagation direction will change. This phenomenon is called refraction of light.

(2) Phenomenon: mirage, "blinking" of stars, broken chopsticks on the water surface, "dislocation" of pens, etc.

13. Refraction characteristics of light: When light slants from air into water or other media, the refracted ray, incident ray and normal line are within ________, the refracted ray and incident ray are located in ________ respectively, and the refraction angle is smaller than the incident angle. As the angle of incidence increases, the angle of refraction also ____. When light passes vertically from air into water or other media, the direction of propagation is _____. In the phenomenon of refraction, the light path _____.

5. Dispersion of light

14. Dispersion of light: The phenomenon that sunlight is decomposed into seven colors of light through a prism: ____, ____, ____, ____, ____, ____, and ____ is called dispersion of light. This phenomenon shows that white light is composed of ________.

15. The three primary colors of light: ____, ____, ____.

16． Infrared rays and ultraviolet rays: Beyond _____ of the spectrum are infrared rays, and beyond _____ of the spectrum are ultraviolet rays; the remote control uses ________ to control, and the banknote detector uses _______ to make the fluorescent material glow to detect the banknotes. Authenticity.

Review the PPT at the end of the chapter, the second part of the content: Textbook knowledge vertical and horizontal

1. Specular reflection and diffuse reflection

2. Real and virtual images

Causes

Converged from actual light rays

It is formed by the intersection of the reverse extension lines of the actual light rays

Review PPT at the end of the chapter, part 3: textbook picture display

Proposition 1: Straight line propagation of light

Transparent substances such as air and water can act as light propagators, and light propagates in straight lines in the same _____ medium.

Proposition 2: Small hole imaging

What is formed in the small hole imaging is an inverted ____ image, and its principle is _________ of light.

Proposition 3: The formation of hand shadows

The formation of hand shadows takes advantage of the _________ of light.

Proposition point 4 Specular reflection and diffuse reflection

When light hits an object, it will undergo _____ reflection or ____ reflection. No matter which kind of reflection, it follows the _________ of light. We can see tables and chairs in different directions in the classroom because ___ reflection occurs when light hits their surfaces.

Proposition 5: Plane mirror imaging

As shown in Figure 4-F-6, the image formed by the plane mirror seen by the eye is not formed by the actual light ______, but is obtained by the reverse extension line ______ of the reflected light. So the image formed by a plane mirror is a ____ image.

Proposition 6: Refraction of light

As shown in Figure 4-F-7, when light slants from the air into water or other transparent media, the refracted light _____ (optional "closer" or "far away") normal, refraction angle _____ (optional "greater than" "less than" or "equal to") angle of incidence. On the contrary, when light enters the air obliquely from water or other transparent media, the refracted light _____ (optional "closer" or "far away") normal line, refraction angle _____ (optional "greater than" "less than" or "equal to" ) angle of incidence.

Review PPT at the end of the chapter, Part 4: Reproduction of key experiments

Experiment 1: Explore the rules of light reflection

(1) Experimental device: As shown in Figure 4-F-10.

(2) Experimental process: omitted.

(3) Experimental conclusion: In the reflection phenomenon, the reflected light, incident light and normal are all within ________; the reflected light and incident light are located on both sides of _____ respectively; the reflection angle _____ the incident angle. ("Three lines are coplanar, the normal line is in the middle, and the two angles are equal.") In the phenomenon of light reflection, the light path is _____.

(4) Discussion and exchange:

①A foldable light screen was used in the experiment. Its function is: ______________; ____________________________. (Write two items)

②In order to verify the reversibility of the optical path, measures should be taken:_______________________________.

Experiment 2: Explore the characteristics of plane mirror imaging

(1) Experimental device: As shown in Figure 4-F-11, a ruler is placed under the upright transparent glass plate, and the ruler is perpendicular to the glass plate; two identical candles A and B are erected on both sides of the glass plate. On the ruler, candle A is used as the imaging object.

(2) Experimental design: In order to facilitate observation, this experiment is best conducted in a ________ (optional "brighter" or "darker") environment; in addition, a transparent glass plate is used instead of a plane mirror. Although the image is not as clear as a plane mirror, But we can observe ______ while observing the image of candle A, which cleverly solves the problem of determining the position and size of the image.

(3) Experimental process: Light candle A and carefully move candle B until the image of candle A is _________. At this time, it is found that the size of the image and the object are _____; further observe the distance between the two candles A and B on the ruler. Position discovery: the line connecting the image and object to the glass plate _____, and the distance from the image and object to the glass plate _____.

(4) Experimental conclusion: The image formed by a plane mirror is ___, the size of the image and the object _____, the distance from the image to the plane mirror _____, the distance from the object to the plane mirror, the line connecting the image to the object and the mirror surface _____.

(5) Evaluation and communication: ① A thinner glass plate should be used in the experiment because of ____________________________.

②No matter how you move candle B, it cannot completely coincide with the image of candle A. The reason is ______________.

③ Candle B should ________ (optional "lit" or "not lit").

(6) Summary: The principle of imaging by a plane mirror is ________, and the images formed are virtual images of ______ and ______.

Review PPT at the end of the chapter, part 5: link to the real test questions of the high school entrance examination

►Type 1: Straight line propagation of light

1. [2018·Heilongjiang] The phenomenon shown in Figure 4-F-12 is caused by the linear propagation of light ()

2. [2018·Binzhou] In the phenomenon shown in Figure 4-F-13, what is formed by the reflection of light is ()

3． [2017·Ordos] Please draw the optical path in Figure 4-F-14 through which the human eye sees the rubber S (represented by a dot) under the table through the plane mirror M.

4. [2018·Hangzhou] In order to explore the reflection laws of light, Xiaojin conducted the experiment shown in Figure 4-F-15.

(1) When the incident angle is 40°, the reflection angle is _____.

(2) Xiaojin rotates the cardboard F backward around the normal line perpendicular to the mirror ON. Can the reflected light still be seen on the cardboard F? ______.

Please analyze the reason:_______________________________.

(3) If the angle between the incident light ray and the plane mirror is 30°, then the angle between the reflected light ray and the incident light ray is ______.

►Type 3: Plane mirror imaging

5. [2018·Qiqihar] "Mo Jing" records optical problems such as the formation of shadows and the reflection of plane mirrors. The optical phenomenon shown in Figure 4-F-16 has the same imaging principle as that of plane mirrors ()

6. [2018·Taizhou] Figure 4-F-17 shows the experimental device to verify the "imaging characteristics of plane mirrors", where A is the candle lit in front of the glass plate, and B is the unlit candle behind the glass plate. Which statement about this experiment is wrong ()

A． The glass panel should be perpendicular to the tabletop

B. Experiments should be conducted in a darker environment

C. Eyes should observe the imaging situation from side B

D. After the candle burns for a long time, the image and object no longer overlap.

7. [2018·Xiangyang] As shown in Figure 4-F-18A, in the experiment to explore the "imaging characteristics of plane mirrors", if candle A is 5 cm away from the glass plate, then candle B is ____cm away from the glass plate can it completely coincide with the image of candle A; if a light screen is placed at candle B; _____ (optional "can" or "cannot") can be connected to the image; if the top of the glass plate is deflected (as shown in Figure B), the candle The image of A in the glass plate will be _____ (choose "higher" or "lower").

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Update Time: 2024-10-20

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