"Propagation of Light" PPT courseware on light phenomena 7

Description

"Propagation of Light" PPT courseware on light phenomena 7

Tangtangqing content:

1. Do you know the light source?

2. Understand the propagation of light along straight lines and its applications.

3. Understand the propagation speed of light in media and the concept of light years.

1. Light source

Think: What is a light source?

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

Classify the following objects: sun, moon, lamp, candle, book, fireflies, fireworks.

Artificial light sources: electric lamps, candles, fireworks

Natural light source: sun fireflies

Non-light source: Moon Books

2. How does light spread?

It was discovered through observation that light travels in straight lines in the air.

It can be seen from the experiment:

The path of light in water is _______________.

The propagation path of light in the air is also ______________.

Similarly, the propagation path of light in glass is also_______________.

light and beam

In physics, a straight line with an arrow is used to represent the propagation path and direction of light, and this straight line with an arrow is called a light ray. Many rays of light together are called a beam.

shadow formation

When light traveling in a straight line encounters an opaque object, it forms a dark area behind the object, called a shadow.

Features of small hole imaging:

1. The image is an inverted real image;

2. The shape of the image has nothing to do with the shape of the hole;

3. The image may be larger or smaller than the actual object.

Light-year: People call the distance that light travels in one year light-year. Therefore, light-year is the unit of _____. So how many meters is 1 light-year?

Known: The speed of light v= 3×108m/s

Time t=365×24×3600s=3.1536×107s

Find: propagation distance s

Solution: s= vt= 3×108m/s×3.1536×107s

=9.4608×1015m

Answer: 1 light year is equal to 9.46×1015m

Keywords: light phenomenon teaching courseware, propagation of light teaching courseware, Lujiao version eighth grade physics PPT courseware download, eighth grade physics slide courseware download, light phenomenon PPT courseware download, propagation of light PPT courseware download, .PPT format;

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

"Changing the Propagation Direction of Light" Wonderful light PPT courseware:

"Changing the Direction of Light Propagation" Wonderful light PPT courseware Propagation of light Objects that can emit light Light source What path does light propagate along? The propagation path of light may be. Conclusion: Light propagates in a straight line in a uniform medium. Speed: 300000 kilometers/second. Light..

"Propagation of Light" PPT courseware on light phenomena 9:

"Propagation of Light" Light Phenomenon PPT Courseware 9 Propagation of Light 1. Understand what a light source is 2. Understand the propagation of light along a straight line and its applications 3. Understand the propagation speed of light in vacuum and air In a dark room, we know nothing I can't see it, what's the reason? one..

"Propagation of Light" PPT courseware on light phenomena 8:

"Propagation of Light" Light Phenomenon PPT Courseware 8 Learning Objectives: 1. Know what a light source is and the two categories of light sources. 2. Summarize the propagation laws of light through experiments and summarize the conditions for straight-line propagation; list application examples of light propagation along straight lines to explain the effects of light propagation along straight lines..

File Info

Update Time: 2024-11-22

This template belongs to Physics courseware Lu Jiao edition eighth grade physics volume 1 industry PPT template

Preview