"Lens" Lens and its applications PPT courseware 7

Description

"Lens" Lens and its applications PPT courseware 7

learning target

1. Be able to distinguish between convex lenses and concave lenses, and know what focus and focal length are.

2. Know the effects of convex lenses and concave lenses on light, know three special rays and be able to draw light path diagrams.

1. Classification of lenses

Convex lens: thick in the middle and thin at the edges

Concave lens: thin in the middle and thick at the edges

2. How to draw a convex lens

How to draw a concave lens

Let’s draw a picture:

Draw a convex lens and a concave lens (and mark the main optical axis and optical center)

Three Experimental Explorations: The Effect of Lenses on Light

4. Focus and focal length of lens

A convex lens can make light parallel to the main optical axis converge at a point, which is called the focus.

The distance from the focus to the optical center is called the focal length

Spread the light path from right to left and find that the light can also converge at the focus.

Explain that a convex lens has two foci on the left and right

three special rays

Convex lens:

1. Light rays parallel to the main axis converge at the focus after passing through the convex lens.

2. The light passing through the focus passes through the lens and is emitted parallel to the main axis.

3. The propagation direction of light passing through the optical center remains unchanged after passing through the convex lens.

concave lens:

1. After the light ray parallel to the main axis passes through the concave lens, the reverse extension line of the refracted light passes through the focus on the same side.

2. The light rays directed to the focus on the opposite side of the concave lens pass through the concave lens and exit parallel to the main axis.

3. The propagation direction of light passing through the optical center remains unchanged.

Drawing rules:

1. All actual rays are represented by solid lines and arrows indicate direction.

2. All auxiliary lines are represented by dashed lines. Such as: normal line, the reverse extension line of refracted light.

3. The main axis is represented by a dotted line.

4. Mark the optical center o and focus F

Knowledge sorting

1. Types of lenses

Convex lens: A lens that is thick in the middle and thin at the edges

Concave lens: a lens that is thin in the middle and thick at the edges

2. The effect of lens on light

Convex lenses have a convergence effect on light, while concave lenses have a divergence effect on light.

3. Focus and focal length of convex lens

A convex lens can make light parallel to the main optical axis converge at a point, which is called the focus.

The distance from the focus to the optical center is the focal length

4. Measurement of focal length of convex lens

solar focusing method

Keywords: Lens and its application teaching courseware, Lens teaching courseware, Lujiao version eighth grade physics PPT courseware download, eighth grade physics slide courseware download, Lens and its application PPT courseware download, Lens PPT courseware download, .PPT format;

For more information about the PPT courseware "Lens and its Applications Lenses", please click the Lenses and Their Applications PPT Lens PPT tab.

"Optical Drawing" Lenses and their Applications PPT:

"Optical Drawing" Lenses and Their Applications PPT [Topic Overview] Optical drawing is a hot topic in the high school entrance examination, involving fill-in-the-blank questions, experimental questions, and calculation and derivation questions. Optical drawing mainly includes: drawing using the reflection and refraction rules of light, drawing the imaging rules of plane mirrors, and lenses.

"End of Chapter Summary and Improvement" Lens and its Application PPT:

"End of Chapter Summary and Improvement" Lenses and their Applications PPT Part One: Key Breakthrough Type 1 Comparison of Convex Lenses and Concave Lenses 1. The following four pictures are the optical path diagrams of light passing through the lens. The correct one is (B) 2. According to the figure The incident ray and outgoing ray shown are...

"Integration of this Chapter" Lens and its Application PPT:

"Integration of this Chapter" Lens and its Application PPT High School Entrance Examination Focus Experience 1. (2018 Inner Mongolia Tongliao High School Entrance Examination) As shown in the figure, scanning the QR code with a mobile phone is equivalent to taking a photo of the QR code. The mobile phone camera is equivalent to a convex lens image sensor, which is equivalent to a light screen The following statement is correct ( )..

File Info

Update Time: 2024-10-05

This template belongs to Physics courseware Lu Jiao edition eighth grade physics volume 1 industry PPT template

Preview