Refractive index is maximum for

Options

A. glass
B. water
C. air
D. diamond

Explanation

To determine which medium has the maximum refractive index, we will follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Refractive Index**:
The refractive index (μ) of a medium is defined as the ratio of the speed of light in a vacuum (c) to the speed of light in that medium (v). The formula is given by:
\[ \mu = \frac{c}{v} \]

2. **Identify the Refractive Indices of Common Materials**:
We need to know the refractive indices of various materials to compare them. Here are some common values:
- Air: μ ≈ 1.000 (approximately equal to 1)
- Water: μ ≈ 1.33
- Crown Glass: μ ≈ 1.517
- Flint Glass: μ ≈ 1.65
- Diamond: μ ≈ 2.417

3. **Compare the Refractive Indices**:
Now, we will compare the refractive indices we have noted:
- Air: 1.000
- Water: 1.33
- Crown Glass: 1.517
- Flint Glass: 1.65
- Diamond: 2.417

4. **Determine the Maximum Refractive Index**:
From the values listed, we can see that the refractive index of diamond (2.417) is the highest among all the materials compared.

5. **Conclusion**:
Therefore, the refractive index is maximum for diamond.

### Final Answer:
The refractive index is maximum for **diamond**.

---