"Refraction of Light" PPT teaching courseware on light phenomena

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"Refraction of Light" PPT teaching courseware on light phenomena

Part One Content: Basic Knowledge Key Points

Knowledge point 1: Refraction of light

1. In an experiment to explore the refraction of light from air into glass obliquely, a student drew a light path diagram as shown in the figure. Please analyze it with the diagram: when light from air into glass obliquely, the refraction angle is less than (optional "greater than" "Less than" or "equal to") the incident angle. When the incident angle increases, the refraction angle will increase (optional "increase", "decrease" or "unchanged").

2. As shown in the figure, a beam of light is reflected and refracted simultaneously at the interface between air and glass, where OA is the refracted light, the reflection angle is equal to 30°, and the right side of MM' is glass (optional "air" or "glass" ).

Knowledge point 2: Refraction phenomenon in life

3. As shown in the picture, place a coin at the bottom of the bowl, step back to a position where your eyes can't see it, and slowly fill the bowl with water. You can see the coin again. This is because light is emitted from the water into the air. refraction occurs.

4. Among the four phenomena shown in the figure, the one that belongs to the refraction of light is (A)

5. Insert a chopstick diagonally into a glass filled with water. The situation when viewed from the front is (B)

Refraction of light PPT, part 2: improvement of comprehensive capabilities

6. A beam of light slants from the air to a liquid surface and is reflected and refracted at the same time. The incident light ray forms an angle of 37° with the liquid surface, as shown in the figure. If the angle between the reflected ray and the refracted ray is 93°, then the reflection angle is 53° and the refraction angle is 34°.

7. As shown in Figure A, a beam of laser AO is incident from the air into the glass brick obliquely. After refraction, it is emitted from the other side. Its exit point may be point C (fill in the letter); if the incident angle is increased, the exit point will be to the right (choose Fill in "to the left", "to the right" or "no change"). As shown in Figure B, in order to protect the dining table, a glass mat is often placed on the dining table. When we eat, we see that the pattern on the table will be higher than the actual pattern position (choose "high", "low" or "unchanged" ).

8. (Zaozhuang High School Entrance Examination) The poem "The solitary smoke is straight in the desert, and the sun is setting in the long river" shows us a beautiful picture. In fact, the sunset observed by the poet is not the actual position of the sun (as shown in the picture), but the image formed by the refraction of sunlight through the uneven atmosphere. The sun is actually at B in the picture (optional "A" or "B") " )s position.

9. In the spring morning, the warm sunshine shines on the calm lake, creating a vibrant scene. During the process of sunlight entering the water (C)

A. The speed does not change, but the direction changes. B. The speed changes, but the direction does not change.

C. Both speed and direction change D. Speed ​​and direction remain unchanged

10. As shown in the figure, light slants from the air to a parallel thick glass plate, and the light is refracted on both its upper and lower surfaces. The roughly correct diagram describing the light propagation path is (D)

11. The archerfish, also known as the anti-aircraft gunfish, has a very unique hunting ability. When it searches for prey resting on branches or grass blades near the water, it will choose a suitable angle, aim at the target, and eject a 1 m jet from its mouth. How high the water column is to knock down the insects into the water and eat them. Judging from the optical knowledge you have learned, when it sprays water underwater on the insects on the surface, the direction of the spray should be (B)

A. Aim at the bug you see

B. Aim below where you see the bug

C. Aim at the top where you see the bug

D. Aim to the right where you see the bug

Refraction of light PPT, Part 3: Expanding exploration and breakthroughs

15. (Anhui High School Entrance Examination) The experimental device as shown in the picture can be used to study the light phenomena that occur when light is incident from water to the interface with air.

(1) If the incident angle i changes from small to large within a certain range, you will find that the refraction angle γ becomes larger (fill in the change rule), and the refraction angle is always greater than the corresponding incident angle;

(2) When the incident angle i increases to a certain value, the refraction angle γ will reach the maximum value, which is 90°;

(3) If you continue to increase the incident angle i, you will find that there is no more refracted light, but only reflected light.

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Update Time: 2024-09-09

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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