"Microscope and Telescope" Lens and its Application PPT Courseware 2

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"Microscope and Telescope" Lens and its Application PPT Courseware 2

Review: Laws of Imaging by Convex Lenses

Thinking: What methods can be used to get a magnified image?

Viewing angle: The angle between two straight lines drawn from the optical center of the eye to the two ends of the object being observed.

Perspective related knowledge:

The wider the viewing angle, the clearer the observation of objects.

The size of the viewing angle is not only related to the size of the object, but also related to the distance from the object to the eye.

Common types of microscopes:

1. Optical microscope: magnify hundreds to thousands of times to see cells clearly.

2. Electron microscope: With higher magnification, it can observe the internal structure of cells, etc.

3. Tunnel scanning microscope: can see the outline of atoms clearly.

Class exercises

There is a set of ( ) at each end of the microscope barrel, the one close to the eye is called ( ), and the one close to the object being observed is ( ).

When observing an object with a microscope, the image formed by the objective lens on the object is a magnified ( ) image (fill in "virtual" or "real"). The principle is just like the image of the lens of ( ), and the function of the eyepiece is like a ( ) again Magnify this image ( ) (fill in “virtual image” or “real image”)

The function of the telescope objective lens is to make the distant object form a ( ) image (fill in "virtual" or "real") near the focus. This image is ( ) (fill in "enlarged" or "reduced"). The principle is like ( ) The lens produces the same image, and the eyepiece acts like a ( ) to magnify the image.

Consolidation exercises

1. There is a set of __________ at each end of the microscope barrel. The one close to the eyes is called __________, and the one close to the object being observed is __________.

2. When observing an object with a microscope, the image formed by the objective lens on the object is a magnified __________ image ("virtual" or "real"). The principle is just like the image formed by a _______ lens, and the eyepiece functions like a _______ Again, this image becomes a magnified ______ ("virtual image" or "real image").

3. The function of a telescope objective lens is to make distant objects form a _____ image (fill in "virtual" or "real") near the focus. This image is ________ (fill in "enlarged" or "reduced"). The reason Just like a ______ lens produces an image, the eyepiece acts like a ______ to magnify the image.

When using a telescope (the objective lens and eyepiece are both convex lenses), in order to make the real image of a distant object (celestial body) through the objective lens as bright as possible, the objective lens must be made larger. The larger the objective lens, the more light can be gathered, and the image The brighter it is, the easier it is to observe farther and darker objects (celestial bodies). The larger the mirror, the longer its focal length. In order to increase the viewing angle as much as possible, the distance between the real image formed by the objective lens and the eyepiece should be as close as possible to the eyepiece. Focal length (smaller than the focal length). In order to allow more light to enter the eyepiece (increase the brightness of the image), the real image formed by the objective lens should be as close as possible to the eyepiece, so the focal length of the eyepiece should be designed to be shorter.

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Update Time: 2024-06-29

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