"Lens" Lenses and their applications PPT download

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"Lens" Lenses and their applications PPT download

Part One Content: Basic Knowledge Key Points

Knowledge point 1 Convex lens and concave lens

1. Among the six lenses shown in the figure, those that are convex lenses are a, c, and d, and those that are concave lenses are b and e.

2.Two lenses as shown in the figure (C)

A. They are all convex lenses that protrude to the right.

B. They are all concave to the right, and they are all concave lenses.

C.a is a convex lens, b is a concave lens

D.b is a convex lens, a is a concave lens

Knowledge point 2: The effect of lens on light

3. As shown in the picture, a student lets sunlight shine on a white wall through a transparent lens. It can be seen from the picture that this lens has a converging effect on light, so the lens is convex (optional "convex" or "convex"). "concave") lens.

4. As shown in the figure, after a beam of parallel light passes through the glass brick with an "air convex lens" in the middle, it will (B)

A. Still parallel light B. Divergent

C. Convergence D. All of the above are possible

Knowledge point 3: Focus and focal length

5. As shown in the figure, point O is the optical center of the convex lens, point F is the focus of the convex lens, and OF is the focal length of the convex lens.

6. As shown in the picture, place the convex lens facing the sun, move the card paper back and forth to get the smallest and brightest light spot, and measure the distance from the light spot to the optical center of the convex lens to be 5 cm. The light spot is formed by the converging effect of the convex lens on the light. The focal length of the convex lens is 5 cm.

Lens PPT, part 2: improvement of comprehensive capabilities

7. Using ice to make fire is by no means a fantasy. When the Antarctic expedition team lost fire, they used easily available ice cubes to grind them into a shape with the middle thicker than the edges (please fill in "thick" or "thin"), such as As shown in the picture, this shape of ice cube is equivalent to a convex lens; let the lens face the sun, adjust the distance between the lens and the hay, so that the hay is just at the focus of the lens, forming the smallest and brightest spot. Hay can be burned.

8. As shown in the figure, two light rays converge at point b. If lens A is placed in the dotted line box, the light will converge at point c. If lens B is placed in the dotted line box, the light will converge at point a. Then lens A is a concave lens and lens B is a convex lens (please fill in "convex" or "concave" for both).

9. As shown in the picture, leave a slightly larger air bubble in the test tube filled with clean water. Let the sunlight shine downward from directly above the test tube. Observe the white paper below the test tube. You can find that the air bubble below the white paper is larger. Dark (select "bright" or "dark" ), this is because sunlight hits air bubbles and water like a concave lens.

10. When Xiao Ming was doing the experiment of measuring the focal length of a convex lens, the focal length measured when the bright spot on the light screen was not the smallest was L, then the actual focal length of the convex lens (D)

A. Greater than L

B. Less than L

C.Equal to L

D. It may be greater than L, it may be less than L

11. Which of the following understandings about the converging effect of convex lenses on light is incorrect (C)

A. A convex lens can make light rays parallel to the main optical axis converge at the focus.

B. The convex lens makes the light that can be converged converge in advance

C. Any beam of light will converge at one point after passing through a convex lens

D. Convex lenses can reduce the divergence of divergent light

Lens PPT, the third part: Expansion, exploration and breakthrough

17. A group of students accidentally dropped a lens on the ground during an activity and broke it into three pieces. They did not know whether the focal length of the broken lens was equal to the original lens, so they selected one of the lenses and measured its focal length.

(1) Please design a simple experiment to measure the focal length of the selected lens. The main equipment used is a parallel light source, a light screen, and a scale; draw a schematic diagram of the experiment you designed in the dotted line box in the picture (the lens in the picture has been draw);

(2) After measurement, they found that the focal length of this lens is equal to that of the original lens. From this, they concluded that "the focal length of each lens is equal to that of the original lens." The main problem with their inference method is that they only measure one piece. The focal length of the lens is accidental.

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For more information about the PPT courseware "Lens and its Applications Lenses", please click the Lenses and Their Applications ppt lens ppt tag.

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"Lens" Lenses and their applications PPT Part 1: Preview of perception 1. Convex lenses and concave lenses 1. Convex lenses. Middle _____edge_____. 2. Concave lens. Middle _____edge_____. 3. Several terms for lenses (as shown in the picture). (1) Optical center. ..

"Lens and Vision" PPT download:

"Lens and Vision" PPT Download Part One: Pre-class Thoughts 1. How to roughly measure the focal length of a convex lens? Face the convex lens to the sun, use a piece of white paper as a light screen on the other side of the convex lens, so that the convergence point of the light appears on the light screen, and use a scale to measure...

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Update Time: 2024-06-29

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

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