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Heat and Light (IV)
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Hello everyone, this is Kori and today we are going to continue talking about heat and light.
00:00:00
We will be focusing on the basic laws of light. Remember, light is radiation we can see with our
00:00:07
eyes. We need light to see objects and determine their shape, size, and color. Reflection is
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one of the basic laws of light. Reflection occurs when light energy
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bounces off a surface and changes direction. Let's discuss how a mirror
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reflects light. So light travels in a straight line from the object to the
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mirror. The mirror reflects the light causing it to change direction. Now the
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boy can see the reflection of the object in the mirror. So light energy hits a
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mirror. The light energy is reflected and the boy sees a reflection in the mirror.
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Reflection can be specular or diffuse.
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Specular reflection is when light rays are reflected off a surface in one direction.
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Mirrors produce specular reflection.
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Diffuse reflection occurs when a surface reflects light rays in lots of directions.
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This happens when a surface is rough. This causes the light to reflect at different angles. A surface
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may look smooth to us, but actually be rough at a microscopic level. So you may need a microscope
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to see that the surface is rough. Refraction. Refraction occurs when light
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passes through some transparent substances and the light energy changes
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direction slightly. Remember, transparent substances are substances that allow all
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all light to pass through. Let's look at how water causes refraction. The water in this cup
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changes the direction of the light energy that passes through it. If we look closely
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at the straw, you can see that the straw appears to be bent. This is because water is
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refracting the light. White light. White light is made up of all the colors combined together.
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red, orange, yellow, green, blue, violet. We can divide white light into colors by refraction
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because each colored light travels at a specific wavelength. So white light is made up of all of
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colors, but we can divide these colors because the light travels at different speeds. They
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travel at different wavelengths. Red has the longest wavelength and violet has the shortest
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wavelength. The wavelengths are different for each color, so we can separate them.
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Okay, that's all for now. I hope you can continue to look on the bright side. Goodbye!
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- Autor/es:
- IDOYA PÉREZ MARTÍN
- Subido por:
- Cp castilla alcobendas
- Licencia:
- Reconocimiento - No comercial - Compartir igual
- Visualizaciones:
- 104
- Fecha:
- 21 de abril de 2020 - 16:34
- Visibilidad:
- Público
- Centro:
- CP INF-PRI CASTILLA
- Duración:
- 05′ 10″
- Relación de aspecto:
- 1.72:1
- Resolución:
- 1184x688 píxeles
- Tamaño:
- 155.52 MBytes
