"Plane Mirror Imaging" Light Phenomenon PPT Courseware 4

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"Plane Mirror Imaging" Light Phenomenon PPT Courseware 4

1. Characteristics of plane mirror imaging:

Ask the question: What are the characteristics of plane mirror imaging?

Conjectures and assumptions: The size of the image and the object may be equal, and the distances from the image and the object to the plane mirror may be equal.

design experiment

experiment equipment:

Two identical candles, white paper, a thin glass plate, a light screen, matches

Experimental steps:

Use a thin glass plate as a plane mirror. A lit candle will form an image in front of the plane mirror. Place an identical unlit candle on the other side of the plane mirror so that it coincides with the image. Observe the distance between the object and the image and the mirror. The relationship is related to the size of the object, changing the distance from the lighted candle mirror, repeating the experiment several times, and measuring multiple times.

Imaging features:

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

2. The size of the image and the object are equal,

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

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

Nature of the image: upright, equal-sized virtual image

Experimental discussion

1. Why use glass plate instead of plane mirror?

The glass plate is transparent and can determine the position of the virtual image

2. Why use two identical candles in the experiment?

To compare the size relationship between objects and images

3. What is the difference between the image formed by a plane mirror and the image formed by a small hole?

The plane mirror forms an upright, equal-sized virtual image, and the small hole forms an inverted real image, which can be large or small (the imaging principles are different)

4. Convex mirror and concave mirror

1. Convex mirrors have a ______ effect on light

The object forms an upright and reduced virtual image in a convex mirror.

A larger area can be observed using a convex mirror.

2. Concave mirrors have a ______ effect on light

Can focus parallel light on one point

Application: Solar cooker

Can turn the light emitted from the focus into parallel light

Applications: Reflective devices for flashlights, car lights, and searchlights

Class exercises

1. A person walks towards a vertically hung plane mirror from a distance. The size of his image in the mirror will be:

A. No change B. Gradually getting bigger

C. Gradually become smaller D. First become larger and then become smaller

2. Draw the image of the following figure in a plane mirror.

3. As shown in the figure, S′ is the image of S in the plane mirror. Draw the position of the plane mirror.

4. A person stands 1m in front of a full-length mirror. The distance from his image in the mirror to the mirror surface is ___m. When he advances 0.5m toward the mirror, the distance between the person and the image is ____m.

What you learned in this lesson:

1. Characteristics (rules) of plane mirror imaging

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

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

3. The size of the image and the object are equal,

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

5. The line connecting the image and the object is perpendicular to the mirror surface

2. Virtual image: an image formed by the convergence of reverse extension lines of reflected light

3. Convex mirror: diffuse the light

Concave mirror: Concentrates light

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Update Time: 2024-10-03

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

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