"Plane Mirror Imaging" PPT courseware on light phenomena

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"Plane Mirror Imaging" PPT courseware on light phenomena

1. Plane mirror

A flat, smooth, imaging reflective surface can be called a plane mirror.

2. Imaging characteristics of plane mirrors

Experiment: Explore the imaging characteristics of plane mirrors

What is the relationship between the image formed by a plane mirror and the object?

Are the images and objects the same size?

Are the positions of the image and the object symmetrical?

Experimental steps

1. Spread a large piece of paper on the table, stand a glass plate on the paper as a plane mirror, draw a straight line on the paper along the glass plate, and note its position.

2. Place a lit candle A in front of the glass plate and see an image behind the glass plate. Then place an identical unlit candle B behind the glass plate. Move candle B until candle B seems to be lit when looking directly in front of the glass plate, that is, B and A coincide. Write down these two on the paper. Location.

3. Change the distance between lit candle A and the mirror and repeat the experiment several times.

Things to note during the experiment:

1. Glass plate erect

2. Draw only one line at the position of the glass plate

3. On the same side of the glass plate, two images of the same candle are sometimes seen through the glass plate. The reason for this phenomenon is that the two surfaces of the glass plate reflect at the same time, and each surface forms an image.

So thinner glass plates should be used.

Summary - Characteristics of plane mirror imaging:

1. The image formed by a plane mirror is a virtual image

2. The size of the image is equal to the size of the object

3. The distance between the image and the object to the plane mirror is equal

4. The line connecting the corresponding points of the image and the object is perpendicular to the mirror surface

5. The left and right sides of images and objects are opposite

3. Principle of plane mirror imaging

The image of a plane mirror is formed by the intersection of the reverse extension lines of reflected light. It is not converged by actual light rays. Since there is no light source S′ behind the plane, the light entering the eye does not really come from there, so S′ is called a virtual image.

Plane mirror imaging

As shown in the figure, MN represents a plane mirror, AB represents the object in front of the mirror, and the diagram is drawn according to the imaging characteristics of the plane mirror.

4. Application of plane mirror—1. Imaging

1. Is the "moon" in the water real? How is it formed?

2. The distance between the moon and the earth is 3.8×108m, and the depth of the well water is 5m. What is the distance between the moon's image and the water surface?

Class exercises

1: "Guilin's landscape is the best in the world". The beautiful peaks on both sides of the Li River clearly reflect "reflections" on the calm water. It is: ( )

A. mountain shadow

B. real image of mountain

C. Inverted virtual image of a mountain

D． Upright virtual image of a mountain

2. A kitten is admiring its own full-body image in front of a plane mirror, as shown in the picture: Which one of the pictures should it see at this time? ( )

3: The image of the clown in a plane mirror, the correct one in the picture is ( )

4: The pointer position on a clock face is seen from a plane mirror as shown in the figure. At this time, the time is ( ).

A. 7:25 B. 6:35

C、5:25 D、4:35

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Update Time: 2024-09-07

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

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