"How to Make It Bigger" Tiny World PPT Courseware 2

Description

"How to Make It Bigger" Tiny World PPT Courseware 2

teaching objectives

1. The combination of two convex lenses can make the image of an object larger;

2. The invention of the microscope has broadened the field of observation. The microscope is an important observation tool for humans to understand the tiny world;

3. Understand the story of Leeuwenhoek.

4. Master the correct steps for using a microscope

Make a simple microscope

1. Compare the effect between a single convex lens and two convex lenses with adjusted focal length---a homemade simple microscope.

2. How does a microscope significantly improve its ability to magnify objects?

——Because "one convex lens in the microscope further magnifies the image formed by the other convex lens."

3. Use a homemade simple microscope to observe surrounding objects. What new discoveries can you make compared with a magnifying glass?

The story of Dutch biologist Leeuwenhoek

Make a simple microscope

Find two convex lenses with different magnifications and adjust the distance between them to observe the object until you can see it most clearly.

Then remove a convex lens and compare the differences in the objects seen twice.

Repeat it several times and see what you find?

Move up and down to adjust the distance between the two convex lenses until you find the clearest image of the object. Use a plastic tube to fix the two lenses, and a simple microscope is ready. Try it and see if the image of the object is enlarged.

tips

In the 17th century, it was discovered that combining two convex lenses significantly improved magnification capabilities. This is because one convex lens further magnifies the image formed by the other convex lens. This is the early microscope. The microscope is an amazing invention that has broadened human vision a lot.

Use a homemade microscope to observe surrounding objects. Compared with a magnifying glass, does the magnification of the image of the object increase?

Have we discovered something new? Write down our findings.

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Update Time: 2024-10-02

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

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