Light of wavelength `5890 Å` travelling in air enters water of `mu = 4//3`. What will be the frequency and wavelength of light in water ?

Explanation

To solve the problem, we need to find the frequency and wavelength of light in water given its wavelength in air and the refractive index of water. Here's the step-by-step solution:

### Step 1: Identify the given values
- Wavelength of light in air, \( \lambda_1 = 5890 \, \text{Å} = 5890 \times 10^{-10} \, \text{m} \)
- Speed of light in air, \( c = 3 \times 10^8 \, \text{m/s} \)
- Refractive index of water, \( \mu = \frac{4}{3} \)

### Step 2: Calculate the frequency of light in air
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