"Integration of this Chapter" Lens and its Application PPT

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"Integration of this Chapter" Lens and its Application PPT

High School Entrance Examination Focus Experience

1. (2018·Inner Mongolia Tongliao High School Entrance Examination) As shown in the picture, scanning the QR code with a mobile phone is equivalent to taking a photo of the QR code. The mobile phone camera is equivalent to a convex lens, and the image sensor is equivalent to a light screen. The following statement is correct: ( )

A. The QR code on the object is the light source

B. When scanning the QR code, the QR code must be located beyond twice the focal length of the camera.

C. To make the image of the QR code smaller on the screen, just bring the QR code closer to the convex lens

D. The image sensor produces an upright real image.

The QR code itself does not emit light and is not a light source, so A is wrong; the mobile phone camera is equivalent to a convex lens, which uses an object beyond twice the focal length to be imaged between one focal length and twice the focal length on the other side, forming an inverted, The principle of reducing the real image works, so B is correct; when a convex lens forms a real image, the distant image of the object becomes smaller. If you want to make the image smaller, you should increase the object distance and move the QR code away from the convex lens, so C is wrong; mobile phone camera It is equivalent to a convex lens, and the image sensor is equivalent to a light screen. What is formed on the image sensor is an inverted and reduced real image, so D is wrong.

2. (2018 Bayannur High School Entrance Examination, Inner Mongolia) In the experiment to explore the imaging rules of convex lenses, the positions of the candle, convex lens and light screen on the light bench are as shown in the figure below. At this time, the candle flame happens to form a clear image on the light screen , the following statement is correct ()

A. The focal length of a convex lens may be 10 cm

B. The imaging characteristics of the convex lens in the picture are applied to the camera

C. Move the candle to the 40 cm mark of the light bench and keep the convex lens still. No matter how you move the light screen, you will not be able to receive the image of the candle.

D. If a pair of myopia glasses is placed between the candle and the convex lens and close to the convex lens, the light screen should be moved to the left to display a clear image again.

3. (2018 Gansu Lanzhou High School Entrance Examination) In the study of junior high school physics, the "images" we often mention are: ① small hole imaging; ② plane mirror imaging; ③ magnifying glass imaging; ④ image projected on the screen by a projector; ⑤The image in the rear mirror of the car. Which of the following statements about the above "like" is correct ()

A. The real images are ①②③

B. The virtual images are ④⑤

C. Image due to reflection ①②⑤

D. Image ③④ due to refraction

①The pinhole imaging is a real image formed by the linear propagation of light. ②Plane mirror imaging is a virtual image formed by the reflection of light. ③Magnifying glass imaging is a convex lens imaging, which is a virtual image formed by the refraction of light. ④The image projected by the projector on the screen is a convex lens imaging, which is a real image formed by the refraction of light. ⑤The car rear view mirror is a convex mirror (or plane mirror), so it forms a virtual image formed by the reflection of light. Among them, the real images are ①④, the virtual images are ②③⑤, the images due to reflection are ②⑤, and the images due to refraction are ③④.

4. (2018 Chifeng High School Entrance Examination in Inner Mongolia) In an experiment to explore the imaging rules of convex lenses, Xiao Ming first used a convex lens with a focal length of 20 cm to conduct the experiment, and obtained a clearly reduced real image on the light screen, as shown in the figure.

(1) He switched to convex lens B of 10 cm to continue the experiment. If the positions of the illuminant and the convex lens are not changed, a clear image must be formed on the light screen. The light screen should face ____ (optional "left" or "right" ")move.

(2) When using 10 cm convex lens B to continue the experiment, the clear image formed by the light screen is tilted downward. To move the image formed by the light screen to the center of the light screen, the convex lens should be directed toward ____ (optional) "up" or "down") move.

(3) When a clear image of the luminous body was obtained on the light screen, Xiao Ming accidentally touched the convex lens with his fingertips. At this time, the light screen ____________________ (optional "There will be an image of the fingertips" "There will be a shadow of the fingertips" or "The image of the luminous body is darker").

Analysis: (1) From "First use convex lens A with a focal length of 20 cm to conduct the experiment, and obtain a clear and reduced real image on the light screen", it can be seen that at this time u>2f; when the convex lens B with a focal length of 10 cm is used to continue the experiment , the convergence effect of the convex lens is stronger, the light converges "in advance", that is, the image distance becomes smaller, and to form a clear image on the light screen, the light screen should move closer to the lens, that is, to the left.

(2) The image is below the light screen, and the direction does not change according to the light passing through the light center. To make the image at the center of the light screen, you can move the candle downward, or the convex lens moves upward, or the light screen moves downward.

(3) If you accidentally touch the convex lens with your fingertips, since other parts of the convex lens can still gather light and form an image, the light screen still shows a complete image of the candle flame, but the image at this time is smaller than before the fingertips touched it. The image is darker.

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Update Time: 2024-10-03

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