Q. When dispersion take place which light deviates least?

A
Red
B
Yellow
C
Violet
D
Cyan
Solution:

? Irregular and partial reflection of light during its passage through a medium is known as scattering of light.

? When red light traverses through the air in long distances it undergoes least scattering. So it reaches our eyes with out considerable loss of intensity.

? This is why red colour is choosen for signal lamp.

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