-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy path18_visible_light.html
43 lines (28 loc) · 3.71 KB
/
18_visible_light.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
<html>
<head>
<p class="head">Visible light</p>
<link rel="stylesheet" type="text/css" href="exampleStyle.css"/>
<hr>
</head>
<body>
<p><a class="def">Visible light</a> is part of <a class="black" href="https://cvertan.github.io/physics4dh.github.io/13_EM_spectrum.html" target="frameterms">electromagnetic spectrum</a> perceived by the human eye. On the electromagnetic spectrum, the visible light spectrum falls between <a class="black" href="https://cvertan.github.io/physics4dh.github.io/10_infrared%20light.html" target="frameterms">infrared</a> and <a class="black" href="https://cvertan.github.io/physics4dh.github.io/11_ultraviolet.html" target="frameterms">ultraviolet waves</a> and has <a class="black" href="https://cvertan.github.io/physics4dh.github.io/15_Wave.html" target="frameterms">wavelengths</a> <a class="def">between 380 and 750 nm</a>. This range is just a tiny part of the entire electromagnetic spectrum, so our eyes can see just a little fraction of all the <a class="black" href="https://cvertan.github.io/physics4dh.github.io/12_EM_radiation.html" target="frameterms">electromagnetic radiation</a> around us.</p>
<p>Stars, candles, light bulbs emit visible light. It makes things able to be seen, so that we get visible information about our word. This makes visible light of the great importance for our life. </p>
<div class="gallery">
<img src="Figures/VisLight.jpg" width="400" height="100">
<div class="desc">Image source: <a href="https://cdn.britannica.com/30/27030-050-EA86AA82/spectrum-wavelengths-longest-lines-diagram-elements-Fraunhofer.jpg" target="_blank">https://cdn.britannica.com</a> </div>
</div>
<p>The spectrum of visible light contains <a class="black" href="https://cvertan.github.io/physics4dh.github.io/15_Wave.html" target="frameterms">waves</a> of all rainbow <a class="black" href="https://cvertan.github.io/physics4dh.github.io/4_Colors%20of%20light.html" target="frameterms">colors</a>: violet, indigo, blue, green, yellow, orange, red. Each color has a different wavelength. Red has the longest wavelength, and violet (∼ 700 nm) has the shortest wavelength (∼ 400 nm).</p>
<p>We can see the <a class="black" href="https://cvertan.github.io/physics4dh.github.io/4_Colors%20of%20light.html" target="frameterms">colors</a> of the rainbow separately, when for example, the Sun shines on tiny droplets of moisture. When all the color waves are seen together, they make white light.</p>
<p>Beside the sight, there are other important uses for visible light. For example, <a class="black" href="https://cvertan.github.io/physics4dh.github.io/22_Laser.html" target="frameterms">lasers</a> emitting in the visible range are widely used in surgery, CD players and laser pointers. Visible light waves also make our TV, computer and cell phone screens work</p>
<div class="gallery">
<img src="Figures/Rainbow.jpg" width="400" height="100">
<div class="desc">White light contains all individual rainbow colors.
Image source: <a href="https://naurok.com.ua/urok-z-vikoristannyam-ozdorovchih-tehnologiy-na-temu-dispersiya-svitla-91425.html">https://naurok.com.ua</a> </div>
</div>
<p class="acknow">Acknowledgements: [<a class="ref" href=bibliography.html#scinasa>scinasa</a>], [<a class="ref" href=bibliography.html#Britannica>Britannica</a>], [<a class="ref" href=bibliography.html#wiki>wiki</a>], [<a class="ref" href=bibliography.html#scienceabc>scienceabc</a>].</p>
<p></p>
<p class="important">More on the subject: <a href="https://science.nasa.gov/ems/09_visiblelight" target="_blank">https://science.nasa.gov/</a></p>
<!--
-->
</body>
</html>