"Magnifying Glass" Tiny World PPT

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"Magnifying Glass" Tiny World PPT

Part One Content: New Lesson Learning

New discoveries under a magnifying glass

Observation method one:

The object being observed does not move, and the distance between the human eye and the object being observed remains unchanged. Move the hand-held magnifying glass back and forth between the object and the human eye until the image is large and clear.

Observation method two:

Bring the magnifying glass to your eyes and move the object until the image is large and clear.

Found through observation:

Photos on print are made up of dots. Because printing uses dot technology.

Found through observation:

If you observe the screens of televisions and computers with the naked eye, you will see many small fluorescent dots. With a magnifying glass, you can see that they are composed of red, green, and blue colors.

Conclusion: Not only the image is enlarged under the magnifying glass, but also many details of the object can be discovered.

Features of magnifying glass

Why can a magnifying glass magnify the image of an object? Notice its characteristics?

What kind of magnifying glass has the highest magnification?

Magnifying glass PPT, part 2: expansion and extension

Magnifying glass: A simple visual optical device used to observe the details of an object. It is a converging lens with a focal length much smaller than the photopic distance of the eye. The size of an object imaged on the retina of the human eye is proportional to the angle of the object to the eye.

Glasses can also be considered a type of magnifying glass. In 1260, Marco Polo once described a Chinese old man wearing glasses to enlarge the font when reading.

Magnifying glass PPT, part 3: Class summary

The magnification of a magnifying glass has nothing to do with the diameter of the lens, but is related to the convexity of the lens. The greater the protrusion of the magnifying glass, the greater the magnification.

Magnifying glass PPT, Part 4: Classroom exercises

1. Fill in the blanks

1. A magnifying glass is ( ), ( ) has the function of magnifying the image of an object. You can use a magnifying glass to observe objects and see more details.

2. The characteristics of the magnifying glass are ( ).

3. ( ) is the main observation tool for people.

2. Multiple choice questions

1. The highest visual acuity of human eyes can see clearly ( ) small objects.

A. One-fifth of a millimeter B. One-fifth of a centimeter

C. One-sixth of a millimeter D. One-sixth of a centimeter

2. The reason why a magnifying glass can magnify is because the magnifying lens is ( )

A. Concave mirror B. Plane mirror

C. Convex lens D. Glass piece

Magnifying glass PPT, Part 5: Homework

Collect information to describe which objects have a magnifying function and explain why.

Keywords: Free download of Chinese PPT courseware for the second volume of the sixth grade in the textbook version, magnifying glass PPT download, tiny world PPT download, .PPT format;

For more information about the "Tiny World Magnifying Glass" PPT courseware, please click the Tiny World ppt Magnifying Glass ppt tag.

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Update Time: 2024-11-20

This template belongs to science courseware Science Edition for Sixth Grade Science Volume 2 industry PPT template

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