PUMPA - SMART LEARNING

எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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How could the white light of the Sun give us various colours of the rainbow?
 
Let us find it out through an activity.
 
Procedure:
  • Take a thick sheet of cardboard and make a small hole or narrow slit in its middle.
  • Allow sunlight to fall on the narrow slit. This gives a narrow beam of white light.
  • Now, take a glass prism and allow the light from the slit to fall on one of its faces, as shown in the figure.
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Dispersion of white light by the glass prism
  • Turn the prism slowly until the light that comes out of it appears on a nearby screen
What do you observe?
 
You will find a .
 
Why does this happen?
 
The prism has probably .
 
Observe the colours that appear at the two extremes of the colour band.
 
What is the sequence of colours that you observe on the screen?
Answer variants:
Blue
Red
Green
Yellow
Indigo
Orange
Violet
1.
2.
3.
4.
5.
6.
7.