A ray of light travelling in the air has wavelength \(\lambda\), frequency \(n\), velocity \(v\), and intensity \(I\). If this ray enters into water then these parameters are \(\lambda', n', v'\) and \(I'\) respectively. Which relation is correct?
1. \(\lambda = \lambda'\)
2. \(n=n'\)
3. \(v=v'\)
4. \(I=I'\)
1. | Two points propagating in two different parallel directions |
2. | One point propagating in two different directions through the slab |
3. | One point propagating in the same direction through the slab |
4. | Two points propagating in two different non-parallel directions |