Which of the following shows Tyndall effect?

Sunbeam coming from behind the clouds looks luminous

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Milk in a glass appearing faint blue

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Sunbeam coming from ventilation

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All of these

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Solution

The correct options are
A
Sunbeam coming from behind the clouds looks luminous

B
Milk in a glass appearing faint blue

The Tyndall effect is defined as light scattering by particles in a colloid or particles in a very fine suspension. As all the examples below show Tyndall effect because:
1. Sunbeam coming from behind the cloud looks luminous because of the scattering of light.
2. Milk in a glass appearing faint blue, since milk is a colloid and light passes through it is scattered.

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