Which of the following will show "Tyndall effect "?
(a) Salt solution
(b) Milk
(c ) Copper sulphate solution
(d) Starch solution.

Explanation

To determine which of the given options will show the Tyndall effect, we need to understand what the Tyndall effect is and which types of mixtures exhibit this phenomenon.

### Step-by-Step Solution:

1. **Understanding the Tyndall Effect**:
- The Tyndall effect is the scattering of light by particles in a colloid or in very fine suspensions. It occurs when light passes through a colloidal solution, causing the light to scatter in different directions.

2. **Identifying the Types of Mixtures**:
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