"Linear Propagation of Light" Light Phenomenon PPT Courseware 3

Description

"Linear Propagation of Light" Light Phenomenon PPT Courseware 3

Questions to think about:

1. Where does light come from?

2. How does light spread?

3. What is the speed of light propagation?

Question: Where does light come from?

1. Light source: An object that can emit light by itself is called a light source.

2.Light source

Like the sun, thunder and lightning, fireflies

like candles, electric lights

Example of light traveling in a straight line

A. Formation of shadow When light encounters an opaque object during its propagation process, since light propagates along a straight line, the light cannot reach the back of the opaque object, and the dark part formed is the shadow of the object.

B. The formation of lunar eclipse

The earth blocks the light from the sun to the moon, forming a large shadow area behind the earth. When the moon is in this area, the sun's light cannot directly shine on the moon, causing a lunar eclipse.

C. Small hole imaging

D. The excavator is working under laser guidance

Class summary

1. Light source: An object that can emit light by itself is called a light source.

2. The principle of linear propagation of light: light propagates in a straight line in the same uniform transparent medium

3. The propagation speed of light: The speed of light in vacuum is 3×10 m/s

Class exercises

Thought 1: Thunder and lightning happen at the same time, why do you see lightning first?

Thought 2: How does the timekeeper keep time during the 100-meter race at the sports meeting? Why?

Class exercises

1. Which of the following objects is a light source ( )

A. The moon B. Fireflies C. Stars at night

D. Polished metal that shines under the sun

2. Regarding the propagation of light, which of the following statements is correct ( )

A. Light does not travel in straight lines in glass

B. Light only travels in straight lines in air

C. Light travels in straight lines under any circumstances

D． Light travels in straight lines in the same homogeneous material.

3. Which of the following phenomena cannot indicate that light propagates in a straight line ( )

A. The formation of shadow B. pinhole imaging

C. Spots of light under the woods D. Thunder is heard after lightning

Keywords: light phenomenon teaching courseware, linear propagation of light teaching courseware, People's Education Edition eighth grade physics PPT courseware download, eighth grade physics slide courseware download, light phenomenon PPT courseware download, linear propagation of light PPT courseware download, .PPT Format;

For more information about the PPT courseware "Light Phenomena: Linear Propagation of Light", please click on the "Light Phenomena ppt: Linear Propagation of Light" ppt tag.

"Linear Propagation of Light" Light Phenomenon PPT Courseware 8:

"Linear Propagation of Light" Light Phenomenon PPT Courseware 8 Teaching Objectives: 1. Be able to identify light sources and know that light sources can be roughly divided into natural light sources and artificial light sources. 2. Understand the linear propagation of light and be able to list the applications of linear propagation of light in life. 3. Know the speed of light in vacuum..

"Linear Propagation of Light" Light Phenomenon PPT Courseware 7:

"Linear Propagation of Light" Light Phenomenon PPT Courseware 7 Colorful Light Phenomenon 1. What is a light source? 2. How does light propagate? How to express the propagation route of light? 3. What are the applications of light propagation? 4. How fast does light travel? 5. The world of science: light years.....

"Linear Propagation of Light" Light Phenomenon PPT Courseware 6:

"Linear Propagation of Light" Light Phenomenon PPT Courseware 6 1. Light source 1. Light source: An object that can emit light is called a light source. 2. Light sources are divided into two categories: natural light sources and artificial light sources. Natural light sources: stars (such as the sun), fireflies, luminous jellyfish, etc. Artificial light source: electric...

File Info

Update Time: 2024-10-05

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

Preview