When monochromatic light travels from one medium to another, its wavelength changes, but its frequency remains the same. Why ?

Explanation

To understand why the frequency of monochromatic light remains constant while its wavelength changes when it travels from one medium to another, we can break down the explanation into a few clear steps:

### Step-by-Step Solution:

1. **Understanding Light Properties**:
- Light can be described by two main properties: frequency (ν) and wavelength (λ). The speed of light (V) in a medium is related to these properties by the equation:
\[
V = ν \cdot λ
...