"Magnifying Glass" Micro World PPT Courseware 3

Description

"Magnifying Glass" Micro World PPT Courseware 3

In science classes, we often use magnifying glasses. What have we observed with them?

What is the difference between observing with a magnifying glass and observing with the naked eye?

Why do people use magnifying glasses to observe?

New discoveries under a magnifying glass

Look at a picture in a science textbook with your eyes, and then look at the picture with a magnifying glass.

What is the difference between the information obtained from the two observations?

What else have we discovered?

What details can only be seen with a magnifying glass?

Features of magnifying glass

Why can a magnifying glass magnify the image of an object? Do we notice its characteristics?

What kind of magnifying glass has the highest magnification?

The characteristics of magnifying glass lenses are transparent, thick in the middle and thin on the edges.

The more convex the lens is in the middle, the higher the magnification.

What characteristics do the lenses of magnifying glasses and devices that can magnify objects have in common?

People call magnifying glasses convex lenses. Why is this?

tips

Humans have long discovered that certain transparent gems can amplify the impact of objects. The earliest lenses used were made of transparent crystals. In the 13th century, Grosseteste, a British bishop, was the first to propose the application of a magnifying device. Based on his suggestion, his student Bacon designed and manufactured glasses that could improve vision.

practise

1. Through observation, we know that the TV screen is actually composed of three colors: ______, ______, and ______.

2. The characteristics of a magnifying glass are ______, ______, ______.

3. The earliest lenses used by humans were made of ______. The first person to propose the application of a magnifying device was ______ in the UK. Glasses that can improve vision were designed and manufactured by ______.

1. We can move the magnifying glass to our eyes, and then move the object until the image is large and clear ( )

2. The small dewdrops that appear on the leaves in the early morning can also magnify the image of the object ( )

3. Transparent objects that are thick in the middle and thin on both sides can enlarge the image of the object. ( )

4. The larger the magnifying glass, the greater the magnification factor. ( )

5. The lenses of myopia glasses can magnify the image of objects. ( )

6. A magnifying glass can reveal the subtleties of an object, allowing us to obtain more information. ( )

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Update Time: 2024-12-04

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

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