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Authoritative PPT Summary
"Understanding Light" PPT
Part One: Teaching Objectives
1. What objects can emit light?
2. What route does light travel along?
3. Where do we need light in our lives?
Artificial light sources are light sources gradually created with the development of human civilization and science and technology. In order of appearance, they include: torches, oil lamps, candles, electric lamps, etc.
The object that emits light is called a light source.
Natural light sources: sun, lightning, fireflies, jellyfish
Artificial light sources: lit candles, glowing lamps, laser beams, etc.
Understanding light PPT, part 2: experiment
Group experiments to verify conjectures
Experimental materials: candles, cardboard, sink, laser light
Experimental purpose: to study the propagation route of light.
my discovery
Light travels in straight lines.
Experimental results
Light travels in all directions along straight lines.
Understanding Light PPT, Part 3: Classroom Exercises
Practice to achieve standards
1. Let me fill it in:
(1) The light emitted by the light source propagates along _____.
(2) It takes time for light to propagate, and the speed of light propagation is _____.
(3) In 1607, _____ conducted an experiment to measure the speed of light, but failed.
2. Which of the following light sources is artificial light source ( ).
A． sun b. Jellyfish c. Candle
3. Under what circumstances does a shadow appear? What does the appearance of the shadow mean?
4. Check the information and talk about what creatures in nature can emit light?
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