"Exploring the Imaging Characteristics of Plane Mirrors" Light and Eyes PPT Courseware 2

Description

"Exploring the Imaging Characteristics of Plane Mirrors" Light and Eyes PPT Courseware 2

learning target

1. Know the characteristics of plane mirror imaging and be able to use the characteristics of plane mirror imaging to analyze and analyze simple phenomena.

2. Know the applications of plane mirrors, concave mirrors and convex mirrors in real life

3. Explore the characteristics of plane mirror imaging through experiments

4. Learn to use the "equivalent substitution method" to determine the position of the virtual image and compare the size of the image and the object

Core test points: Drawings and experiments on plane mirror imaging

Preview before class

1. The imaging rules of a plane mirror: the size of the image and the object _____, the distance between the image and the object and the plane mirror _____, the connection between the image and the object and the mirror surface _____. The image of an object in a plane mirror is _____.

2. In the experiment to explore the "characteristics of plane mirror imaging", the equipment used mainly includes __________, __________, ________, ________, etc.

3. Application of plane mirror: It can be used not only for imaging, but also for changing the direction of light propagation. The principle is light.

4. In physics, images that can be displayed on a light screen are called ________ images; images that cannot be displayed on a light screen and can only be seen directly with the eyes are called ________ images.

5. Convex mirrors and concave mirrors are collectively called ________. Convex mirrors have a _____ effect on light; practical applications include: _________; concave mirrors have a ______ effect on light. Practical applications such as: _________.

Lectures in class

Knowledge point 1. Principles and characteristics of plane mirror imaging

(1) When you stand in front of a mirror, you can see another "you" in the mirror. The "person" in the mirror is your image; when any object is placed in front of a flat mirror, there will be an image of the object in the mirror. , this phenomenon is called plane mirror imaging.

(2) The imaging principle of plane mirrors is the law of light reflection.

As shown in the figure below, the light rays SA and SC from a certain point (such as S) on the object are directed to the plane mirror. After being reflected by the plane mirror, they are emitted into the observer's eyes along the directions AB and CD. The observer feels that the reflected light rays seem to come from behind the mirror. So this image is called a virtual image. The object in front of the mirror can be seen as composed of many such points. Each point has an image in the mirror. These images form the image of the object. The image of the object in the plane mirror is also a virtual image.

Note: ① The virtual image is not formed by the intersection of actual light rays, but by the intersection of the reflection extension lines of actual light rays. Therefore, no light is emitted from the position of the virtual image. When the human eye looks at the virtual image, the light rays entering the human eye are not The light emitted from the virtual image is the light emitted from the object in front of the mirror to the plane mirror, and then enters the human eye after being reflected by the plane mirror; ② Because the virtual image is not formed by the convergence of actual light, the virtual image cannot be received with a light screen.

(3) Imaging characteristics of plane mirrors

①The size of the image and the object are equal;

②The distance from the image and object to the mirror is equal;

③The line connecting the corresponding points of the image and object is perpendicular to the mirror surface;

④The left and right sides of images and objects are opposite

⑤Like virtual image

It can be abbreviated as: "equal size, equal distance, vertical, virtual image".

Knowledge point 2. Application of plane mirror imaging

(1) The most common application is to see ourselves through a plane mirror.

(2) Use plane mirrors to increase visual space.

For example: hanging a flat mirror on a wall in the living room can make our visual space twice the actual size.

(3) Stomatologists use plane mirrors to conveniently observe parts that are difficult to see directly.

(4) Use a periscope underwater to observe the situation on the sea surface.

(5) Use a kaleidoscope made of multiple plane mirrors to see beautiful patterns.

Knowledge point 5. Plane mirror imaging drawing

There are two methods for plane mirror imaging:

(1) Draw according to the law of light reflection (Figure A below).

Note: ① Each object point should draw two incident rays and the corresponding reflected rays

②The virtual image must draw a dotted line.

(2) Draw a diagram based on the imaging characteristics of a plane mirror (Figure B below)

Note: ① The symmetry points of the key points that constitute the shape of the object.

②The line connecting the corresponding points of the image and object must be perpendicular to the mirror surface.

③The image must be drawn as a dotted line.

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"Exploring the Imaging Characteristics of Plane Mirrors" PPT courseware on light and eyes:

"Exploring the Imaging Characteristics of Plane Mirrors" Light and Eyes PPT Courseware Teaching Objectives 1. Know the characteristics of plane mirror imaging and be able to use the characteristics of plane mirror imaging to analyze and explain simple phenomena. 2. Understand concave mirrors and convex mirrors and their effects on light. 3. Pass...

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Update Time: 2024-10-19

This template belongs to Physics courseware Guangdong and Shanghai version of eighth grade physics volume one industry PPT template

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