"Microscope and Telescope" Lenses and Their Applications PPT Download

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"Microscope and Telescope" Lenses and Their Applications PPT Download

Part One Content: Basic Knowledge Key Points

Knowledge point 1 Microscope

1. A small mirror is usually used as a reflector under the microscope. This small mirror is a concave (optional "convex" or "concave") mirror, and its function is to enhance the brightness of the image seen by humans (optional "enhanced" or "weakened").

2. There is a set of lenses at both ends of the microscope barrel. Each set of lenses functions as a convex lens. When the human eye observes small objects through a microscope, what it sees is a magnified virtual (choose "virtual" or "real" )picture. The objective lens is equivalent to the lens of a projector (optional "projector" or "camera").

3. When Xiao Ming used a microscope to observe epithelial tissue cells, he adjusted so that the object being observed was in the center of the field of view, but the image was too small and the observation was unclear. At this time, he should (B)

A. Move the objective lens away from the object and keep the eyepiece position unchanged

B. Move the objective lens closer to the object and the eyepiece further away from the objective lens.

C. Keep the objective lens away from the object and the eyepiece closer to the objective lens.

D. Keep the position of the objective lens unchanged and move the eyepiece closer to the objective lens.

Knowledge Point 2 Telescope

4. There is a kind of telescope composed of two convex lenses. The objective lens acts like a camera (optional "camera" or "projector"). The imaging principle of the eyepiece is the same as that of a magnifying glass (optional "plane mirror" or "magnifying glass"). .

5. On the evening of January 31, 2018, almost all areas in my country enjoyed the charming scene of a "red moon" hanging high in the night sky (as shown in the picture). Many astronomy enthusiasts use telescopes to enjoy the beautiful lunar eclipse landscape, and some use cameras to record the entire process. Which of the following statements is correct (C)

A. The objective lens of a telescope and the objective lens of a microscope have the same function

B. The image formed by the camera is upright and enlarged

C. Through the objective lens of the telescope, an inverted and reduced real image is formed.

D. When the camera records the "red moon", the lens should be retracted

6. The telescope used by astronomy enthusiasts is as shown in the picture. Which of the following is correct (D)

A.A lens is the eyepiece

B.B lens is the objective lens

C. Since there is no light screen, the stars in space form virtual images through mirror A.

The imaging principle of D.B mirror is the same as that of magnifying glass

7. Regarding perspective, which of the following statements is correct (A)

A. The size of the image on the retina of the eye depends on the angle between the object and the optical center of the eye, that is, the angle between the two lines drawn from both ends of the object to the optical center of the eye. This is the viewing angle.

B. The larger the viewing angle, the clearer the objects we see.

C. The smaller the viewing angle, the clearer the objects we see

D. The angle of view is the angle seen by the eyes

Knowledge point 3: Explore the universe

8. Which of the following statements is correct (D)

A. The sun is the center of the universe

B. The sun is stationary and the earth and other planets move around the sun

C. "Heliocentric theory" is wrong, "Geocentric theory" is correct

D. The Milky Way is very large, it contains the solar system

Microscope and telescope PPT, part 2: improvement of comprehensive capabilities

9. As shown in the picture, Xiao Ming found two magnifying glasses with different focal lengths to simulate telescopes to observe distant scenery. The function of the farther objective lens is to make the object become an inverted and reduced (optional "zoom in" or "zoom out") real image. , the eyepiece becomes a virtual (optional "real" or "virtual") image.

10. The figure shows the principle of an optical instrument. In the figure, L1 is the objective lens and L2 is the eyepiece. This instrument is a telescope (optional "telescope" or "microscope").

11. As shown in the figure, the stomata on the plant leaves are observed through a microscope. At this time, the relationship between the distance u from the observed leaf to the objective lens and the focal length f of the objective lens is f

12. Use a microscope and an ordinary astronomical telescope to observe objects. Which of the following statements about the upright and inverted images is correct (B)

A. When viewed with a microscope, it appears to be upside down; when viewed with an astronomical telescope, it appears to be upright.

B. It looks like it’s upside down when you look at it with a microscope, and it looks like it’s upside down when you look at it with an astronomical telescope.

C. When viewed with a microscope, it appears to be upright; when viewed with an astronomical telescope, it appears to be upside down.

D. When observed with a microscope, it appears to be upright. When observed with an astronomical telescope, it appears to be upright.

13. In biology class, we have to use a microscope to observe cells. Which of the following statements is incorrect (D)

A. The image formed by the objective lens is formed by the refraction of light

B. In order to see clearly the cells that do not emit light, sometimes it is necessary to use a reflector to increase the brightness. This reflector makes use of the reflection of light.

C. The magnified real image formed by the objective lens can be taken over by a light screen

D. The image formed by the objective lens has the same properties as the image formed by the camera

14. When using an ordinary telescope to observe distant objects, a small flying insect suddenly flies to the objective lens, then the field of view (B)

A. A big flying insect appeared B. No flying insects or black spots appeared

C. A big black spot appeared D. A small flying insect appeared

15. According to the analysis of the imaging rules of convex lenses, the image formed by a small object after passing through the microscope objective is located at (C)

A. Within 1 times the focal length of the objective lens

B. Between 1x focal length and 2x focal length of the objective lens

C. Within 1 times the focal length of the eyepiece

D. Between the 1x focal length and 2x focal length of the eyepiece

Microscope and telescope PPT, part 3: Expanding exploration and breakthroughs

18. As shown in the figure, in the experiment of homemade water droplet microscope, the equipment used includes a convex lens with a long focal length, a dropper, a waste tape box, and clean water.

(1) A small water droplet can be regarded as a convex lens with a small focal length. In this experiment, a small water droplet is used as the objective lens of the microscope. The distance between it and the object being observed is 10~15 mm, as shown in the figure;

(2) Drop a drop of water at will. If you see an enlarged arrow in the same direction as the original through this small water drop, the water drop should become thicker without adjusting the distance between the waste tape box and the arrow (optional " "Thick" or "Thin") until you see the enlarged arrow in the opposite direction to the original direction. If the thickness of the waste tape box is 12 mm, then the final focal length range of the water droplet is 6~12 mm;

(3) Observe the small water droplet through the convex lens, make sure that the arrow, the small water droplet, and the convex lens are on the same vertical straight line, and keep the convex lens horizontal. The arrow you see is inverted relative to the original arrow (optional "upright" or " "Inverted"), if you want to see a larger image of the arrow, you should move the convex lens slightly upward (optional "up" or "down").

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Update Time: 2024-06-27

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