"Exploration - Characteristics of Plane Mirror Imaging" Light Phenomenon PPT Courseware 3

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"Exploration - Characteristics of Plane Mirror Imaging" Light Phenomenon PPT Courseware 3

1. Characteristics of plane mirror imaging

Plane mirror The reflecting surface is flat

Think about it: What reflective surfaces in life are flat?

Explore the characteristics of plane mirror imaging

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

(2) Conjectures and assumptions: the size of the image and the object may be equal; the size of the image and the object

The distance from the body to the plane mirror may be equal; the image and object are symmetrical about the mirror plane.

(3) Make plans and design experiments

Experimental equipment: plane mirror, scale, candles, matches, flat glass, scale, candles, matches

Experimental method: equivalent substitution method

(It refers to a method of transforming abstract and complex physical processes or phenomena into ideal, simple processes or phenomena for research and processing under the premise of having the same effect.)

2. Virtual image

(1) How does the human eye determine the position of an object?

(2) How does the human eye see the image in a plane mirror? ——The reason for the imaging of plane mirrors

Virtual image: It is not formed by the convergence of actual light rays, but is formed by the intersection of the reverse extension lines of reflected light rays. Virtual images cannot be displayed on a light screen.

Thinking: How to create the reflected light after any two light rays emitted by a point light source are reflected by a plane mirror?

3. Application of plane mirror

(1) Imaging

Such as: dressing mirror, mirror in the practice room, "kaleidoscope" for children to play with

(2) Change the light path

(3) Use flat mirrors to decorate the walls to give people the feeling of expanding the visual space

4. Spherical mirror

(1) Concave mirror

Definition: Use the inner surface of the sphere as the reflecting surface.

Properties: A concave mirror can converge the parallel light rays directed toward it at one point; the reflected light from the focus to the concave mirror is parallel light.

Applications: solar cookers, flashlights, car headlights

(2) Convex mirror

Definition: Use the outer surface of a sphere as a reflective surface.

Properties: Convex mirrors diffuse light. The image formed by the convex mirror is a reduced virtual image.

Application: car rearview mirror, reflector at corners

Classroom exercises

Point out the physical laws that light obeys in the propagation process explained by the "shadow" in the following sentences,

(1)Hand shadow

(2) Reflection in water

(3) Instant results

(4) Cup bow snake shadow

1. 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? ( )

2: 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

Classroom exercises

1: Reflection can also occur on the water surface. When we see an airplane in the sky from the water, it looks like _______. (Fill in "virtual" and "real")

2: A convex mirror makes parallel beams ________, and a concave mirror makes parallel beams ________. The rearview mirror of a car is a ________ mirror, which can be used to ________ the driver's field of vision.

3: The reflective device of the flashlight is equivalent to a ________ mirror. It can turn the light emitted by the small electric beads into ________ light and emit it.

4: The solar cooker is made of _________ mirror, which can make the sunlight shining on the surface _________ at one point. The larger the area of ​​the concave mirror, the more concentrated sunlight will be ________, and the temperature will be _________. It can be used not only to boil water and cook rice, but also to generate electricity and smelt, so it is an environmentally friendly energy that saves fuel and does not _________.

5: The image formed by the plane mirror is _________ displayed on the light screen (fill in "can" or "cannot"). The image formed by the plane mirror is the result of _________ when the light reflected by the object or the light emitted by the object hits the plane mirror.

A classmate jumped from 2 m away from the plane mirror to 4 m away from the plane mirror in front of a vertical plane mirror. Which of the following statements about the size of the image in the mirror and the distance of the image is correct?

A. The image is the same size as the classmate, and the distance from the image to the classmate becomes 6m.

B. The image is the same size as the classmate, and the distance from the image to the classmate becomes 8m.

C. The image is larger than the classmate, and the distance from the image to the classmate becomes 6m.

D. The image is smaller than the classmate, and the distance from the image to the classmate becomes 8m.

When Xiao Ming did an experiment to study the imaging of a plane mirror, he first placed the candle 50cm in front of the plane mirror. He noted the position of the image. Then, he moved the plane mirror 10cm toward the candle. The position of the second imaging was the same as the first imaging. location comparison

A. Moved 10cm toward the plane mirror

B. Moved 20cm toward the plane mirror

C. 10cm away from the plane mirror

D. 20cm away from the plane mirror

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Update Time: 2024-10-20

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