Refractive index of glass with respect to water is `(9//8)`.
Refractive index of glass with respect to air is `(3//2)`. find the refractive index of water with respect to air .

Explanation

To find the refractive index of water with respect to air, we can use the relationship between the refractive indices of glass, water, and air.

### Step-by-Step Solution:

1. **Identify the given refractive indices:**
- Refractive index of glass with respect to water, \( n_{gw} = \frac{9}{8} \)
- Refractive index of glass with respect to air, \( n_{ga} = \frac{3}{2} \)

2. **Use the formula for refractive indices:**
The refractive index of water with respect to air can be calculated using the formula:
\[ n_{wa} = \frac{n_{ga}}{n_{gw}} \]
where:
- \( n_{wa} \) is the refractive index of water with respect to air,
- \( n_{ga} \) is the refractive index of glass with respect to air,
- \( n_{gw} \) is the refractive index of glass with respect to water.

3. **Substitute the values into the formula:**
\[ n_{wa} = \frac{\frac{3}{2}}{\frac{9}{8}} \]

4. **Simplify the expression:**
To divide by a fraction, we multiply by its reciprocal:
\[ n_{wa} = \frac{3}{2} \times \frac{8}{9} \]

5. **Perform the multiplication:**
\[ n_{wa} = \frac{3 \times 8}{2 \times 9} = \frac{24}{18} \]

6. **Reduce the fraction:**
\[ n_{wa} = \frac{4}{3} \]

7. **Conclusion:**
The refractive index of water with respect to air is \( \frac{4}{3} \).

### Final Answer:
The refractive index of water with respect to air is \( \frac{4}{3} \).

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