"Reflection of Light" Light PPT

Description

"Reflection of Light" Light PPT

Part One: Illuminating the Target

Turn on the flashlight switch and let the light illuminate the book on the table from top to bottom. How does the light illuminate the book? Draw the path of light on the diagram.

Without changing the position of the flashlight and standing the book up, how can the light of the flashlight shine on the book? Draw the method we used and the path of light, and describe how the light hits the book.

Without changing the position of the flashlight, can we find a way to illuminate the toy in the shadow? Draw a map of our approach and the path of light, and describe how light travels.

Light travels in straight lines. But when we use a mirror to block the path of light, we will find that the light changes the direction of propagation.

When light hits a mirror, it changes its propagation direction and is reflected back. This phenomenon is called reflection of light, also called reflection. Reflected light also travels in straight lines.

Reflection of light PPT, part 2: using reflection of light

In life, people often cleverly use the reflection of light to solve difficult problems. Try to map the path of light.

Car reflectors allow the driver to see what is behind the car.

The doctor brought a forehead mirror to examine the patient's ears.

Why do we need to install lampshades on lighting lamps?

The lampshade can reflect the upward light of the bulb downward and combine it with the original downward light to increase the brightness.

How far away the moon is from us is a difficult problem that cannot be measured with a ruler. When American astronauts landed on the moon in 1969 and 1971, scientists used the principle of light reflection to solve this problem.

They placed several special mirrors (laser reflectors) on the moon. Scientists on Earth shine light into a mirror, which returns light in the direction of the incident light. Scientists measured the time it took for light to reflect back to the ground, and then calculated the exact distance from the earth to the moon based on the speed of light to be 384,403 kilometers.

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For more information about the "Reflection of Light" PPT courseware, please click the "Reflection of Light ppt" ppt tag.

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Update Time: 2024-09-08

This template belongs to science courseware Fifth Grade Science Volume 1, Textbook Edition industry PPT template

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