"Laws of Imaging by Convex Lenses" Lenses and Their Applications PPT Courseware 4

Description

"Laws of Imaging by Convex Lenses" Lenses and Their Applications PPT Courseware 4

teaching objectives:

Knowledge and skills

Understand the imaging rules of convex lenses.

Process and Method

Able to initially acquire the ability to ask questions through inquiry activities.

Through inquiry activities, experience the entire process and methods of scientific inquiry.

Learn how to generalize scientific rules from physical phenomena.

Emotional attitudes and values

Have a thirst for scientific knowledge, be willing to explore natural phenomena and physical principles in daily life, and use it to explore the physical principles in daily necessities.

Key points and difficulties in learning:

Key points: (1) Understanding and understanding of the imaging rules of convex lenses.

(2) Cultivate students’ methods of scientific inquiry.

Difficulty: Design and complete experiments to explore the imaging rules of convex lenses.

Analysis and conclusion:

1. Under what conditions does a convex lens form a real image? Under what conditions does it become a virtual image?

2. Under what conditions does a convex lens produce a reduced image? Under what conditions does it become an enlarged image?

3. Does the image formed by a convex lens have an upright real image? Is there an illusion of being upside down?

summary

1. U=f is the dividing point between virtual and real imaging.

When the object distance is greater than twice the focal length of the lens, the object forms a real image;

When the object distance is less than one focal length of the lens, the object becomes a virtual image.

2. U=2f is the dividing point of imaging size.

When the object distance is greater than twice the focal length of the lens, the object becomes a reduced image;

When the object distance is less than twice the focal length of the lens, the object becomes a magnified image.

3. The real images formed by convex lenses are all inverted; the virtual images are upright.

practise:

In the experiment to study the imaging of convex lenses:

(1) A beam of parallel light is incident on a convex lens and converges at point A after passing through the lens. If point A is measured to be 10 cm away from the lens, the focal length of the lens is ( ) cm.

(2) If the candle flame is placed 8 cm away from the above lens, a _______________ image can be obtained through the lens. (Characteristics of image filling: inversion, enlargement and reduction, virtual and real)

(3) If the candle flame is placed 12 cm in front of the lens, a _______________ image can be obtained through the lens.

(4) If the candle flame is placed 25 cm in front of the lens, a _______________ image can be obtained through the lens.

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Update Time: 2024-11-22

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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