"Reflection of Light" PPT teaching courseware on light phenomena

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"Reflection of Light" PPT teaching courseware on light phenomena

Part One Content: Basic Knowledge Key Points

Knowledge point 1: The reflection phenomenon of light

1. "A setting sun spreads over the water, half of the river is rustling and half of the river is red." This is a poem by Bai Juyi. The phenomenon described in the poem belongs to the phenomenon of reflection of light.

2. Which of the following statements about light phenomena and their causes is incorrect (D)

A. Blackboard reflection - reflection of light

B. Reflection in water - reflection of light

C. Light spot under the tree - light travels in a straight line

D. Small hole imaging - reflection of light

Knowledge point 2: The law of reflection of light

3. At noon in summer, the sunlight hits the calm lake surface vertically, and the incident angle is 0° at this time; when the sun gradually tilts westward, the sunlight is reflected on the water surface, and the reflection angle will increase (optional "increase" or "decrease" ” ); When the sun shines on a calm lake at an angle of 55° from the water surface, the reflection angle is 35°.

4. In the experiment of "Exploring the Laws of Light Reflection", a piece of cardboard was placed vertically on a plane mirror. A beam of light is incident along EO and emerges along OF, as shown in the figure. The reflection angle is ∠NOF; change the incident direction of light and bring the incident light closer to the normal, the reflection angle becomes smaller; take NO as the axis, rotate the right half of the cardboard backwards, it cannot be done on the cardboard (optional " "Can" or "Can't") observe reflected rays, which means that the reflected rays, incident rays and normals are in the same plane.

Knowledge point 3: Reversibility of light path and specular reflection and diffuse reflection

5. If you see another classmate’s eyes in a plane mirror, the classmate will definitely see your eyes through the plane mirror. This is mainly because (C)

A. Diffuse reflection of light B. Specular reflection of light

C. Reversible light path D. Direct exposure to light

6. The "Mirror of the Sky" is located in the Chaka Salt Lake in Qinghai, as shown in the picture. This is due to the specular (optional "specular" or "diffuse") reflection of light on the lake surface, causing the reflection of the white clouds to connect with the lake water. It's like a fairyland.

7. As shown in the figure, the reflection phenomenon occurs when a beam of light shines on a reflective surface. The following statement is correct (C)

A. This is specular reflection, following the law of light reflection

B. This is diffuse reflection and does not follow the law of light reflection.

C. The reflection of the rough projection screen is the same as the reflection type in this picture.

D. The reflection of the weeping willow on the river is the same as the reflection type in this picture.

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

8. At night, Xiao Ming spread a piece of white paper on the table, placed a small plane mirror flat on the paper with the mirror surface facing up, turned off the indoor lights, and used a flashlight to shine directly on the plane mirror, as shown in the picture. At this time, people observe from the side that the brighter thing is white paper (optional "white paper" or "plane mirror"). This is because the light from the flashlight is diffusely reflected on its surface (optional "specular reflection" or "specular reflection"). "diffuse reflection").

9. (Anhui High School Entrance Examination) Some light phenomena in life: ① The shadow of the tree under the sun; ② The water surface is sparkling; ③ The police vest worn by the traffic police is very bright under the light; ④ Standing on the shore, you can see into the water fish. Among them, the ones that can be explained by the knowledge of light reflection are

②③(fill in the serial number).

10. When the incident light ray forms an angle of 60° with the plane mirror, which of the following statements is correct (A)

A.The angle of incidence is 30°

B. The reflection angle is 60°

C. The angle between the reflected light and the mirror is 30°

D. The incident angle increases by 5° and the reflection angle increases by 10°.

11. After a rain on a summer night, experienced people can flexibly use the moonlight to walk at night and easily avoid puddles. In the following introduction to these experiences, the correct statement is (B)

A. When walking towards the moon, your feet should be on the brighter place

B. Walk towards the moon, your feet should be stepping on darker areas

C. When walking with the moon on your back, your feet should be in a darker place

D. Whether walking toward or against the moon, always step on the brighter place

12. As shown in the figure is a simplified diagram of the light path of the headlight when the car is driving on dry asphalt pavement and wet asphalt pavement at night. When driving at night (C)

A. Diffuse reflection of light is more likely to occur on wet roads

B. Dry road surface refracts light

C. When there is no car on the other side, the wet road looks darker to the driver.

D. The light shining on the dry road surface does not follow the law of light reflection.

Reflection of light PPT, Part 3: Expansion, exploration and improvement

15. As shown in the figure, the ranger uses a plane mirror to direct the sunlight at this time to point P in the cave. Please draw a diagram to indicate the position of the plane mirror and mark the degree of the reflection angle.

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For more information about the "Reflection of Light PPT" PPT courseware, please click on the "Reflection of Light PPT Light Phenomenon ppt" tab.

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Update Time: 2024-09-01

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

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