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3
Transcript
Light Shows
L.S
Introduction
The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 390 to 700 nano metres. The suns light goes in multipul directions and the laser light is like a torch it goes in only one direction.
3 Classification of materials.
Transparent
Allowing light to pass through so that objects behind can be seen. Items to show that this is factual. Mirror, glass and plastic.
Opaque
Opaque means that you can't see through the object so glass is not opaque because you can see through it.
e.g an apple, people, metel and wood.
Translucent
Allowing light but not detailed shapes to pass through it because it is partly see through but most of it isn't. Semi transparent is something like our skin some light can pass through but not all of it. That is why we cast a shadow.
Absorbtion and Reflection.
Blue light alone can make a red shirt black by shining on it because the red shirt would absorb the light. White objects appear to be white because it reflects all of the colours.
Meaning of propagation
The breeding of specimens of a plant or animal by natural processes from the parent stock.
why we see colours
The colours we see are the wavelengths that are reflected or transmitted. For example, a red shirt looks red because the dye molecules in the fabric have absorbed the wavelengths of light from the violet/blue end of the spectrum.
Refraction
Radio waves etc. being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density. Change direction of propagation of any wave as a result of its travelling at different speeds at different points along the wave front.
Transmitteds meaning
Moving things from one place to another.
Conclusion
In conclusion i hope that you learned as much about light as i have. I also hope that you have learned about reflection, refraction and absorption.
Websites
https://en.wikipedia.org/wiki/Visible_spectrum
https://www.sciencelearn.org.nz/resources/47-colours-of-light
Picture
https://upload.wikimedia.org/wikipedia/commons/thumb/c/c2/AdditiveColor.svg/2000px-AdditiveColor.svg.png
https://www.sciencelearn.org.nz/system/images/images/000/000/037/full/LIS_SCI_ART_02_Colours_of_light_visible_spectrum_waves_v02.jpg?1491943756
http://nineplanets.org/sol.html
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