Yellow light with wavefront 0.5` mum` is air surface refraction in a medium in which velocity of light is `2xx10^(-8)m//s`. Then the wavelength of the light in the medium would be .

Explanation

To solve the problem step by step, we will follow the principles of wave optics, specifically focusing on the relationship between wavelength, velocity, and the mediums involved.

### Step-by-Step Solution:

1. **Identify Given Values**:
- Wavelength of yellow light in air (λ₁) = 0.5 micrometers = \(0.5 \times 10^{-6}\) meters.
- Velocity of light in the medium (v₂) = \(2 \times 10^{-8}\) m/s.
- Velocity of light in air (v₁) = \(3 \times 10^{8}\) m/s (approximately).
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