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What is especially observed when a beam ...

What is especially observed when a beam of light is passed through a colloidal solution?

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### Step-by-Step Solution: 1. **Understanding the Question**: The question asks what is observed when a beam of light is passed through a colloidal solution. 2. **Identifying the Key Concept**: The key concept related to the interaction of light with colloidal solutions is the Tyndall effect. 3. **Defining the Tyndall Effect**: The Tyndall effect is the scattering of light by particles in a colloid or particles in a very fine suspension. ...
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