show and explain with activity the phenomenon of dispersion of white light
Answers
Aim :- To prove the dispersion of white light
Materials required:- Triangular glass prism, Torchlight
Procedure :-
1. Take the torchlight and prism in hand.
2. Align the torchlight and prism into a straight line.
3. Switch on the torchlight.
Observation :- As the light passes through the prism, the white light divides into seven colors namely, red, orange, yellow, green, blue, indigo and violet
Conclusion :- Therefore, white light disperses after passing through transparent objects.
Activity :-
Allow a narrow beam of white light to fall on one face of a prism . Hold a white screen on the other side so that light emerging out of the other face falls on it .
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What do you observe on the screen ?
You will se that the white light has split up into different colors on the screen . You will see seven colors in the following order ::
- Violet
- Indigo
- Blue
- Green
- Yellow
- Orange
- Red
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These colors can be remembered by a word VIBGYOR
Violet is the most deviated and red is the least deviated .
Natural Example :-
The rainbow is a very common example of dispersion of light in nature.
How is it formed ?
Tiny droplets of water remain suspended in the atmosphere after it has ceased to rain . When the sun appears , the light gets dispersed through these suspended drops of water as prism . The ray undergoes dispersion and as a result rainbow is formed.
