When light is passed through water containing a few drops of milk, it shows a bluish tinge. This is due to the _____ of light by milk and the phenomenon is called ______. This indicates that milk is a _______ solution.
A
Scattering
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B
Tyndall effect; colloidal
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Solution
Colloids:
Colloids are mixtures in which particles of one substance are suspended in the other.
Milk drops in water thus is a colloidal solution.
Scattering of light:
When light passes through such a colloidal solution, it scatters thus making the path of the beam of light visible.
The blue tinge is due to the fact that the blue color in the visible spectrum scatters the most. The scattering of light by colloidal particles is called the Tyndall effect.