Unpolarised light refers to light waves that vibrate in all directions perpendicular to the direction of propagation. This means that the electric and magnetic fields of the light are oscillating in all possible planes.
When unpolarised light is incident on a water surface, it can become partially polarised due to the reflection and refraction of the light. This means that the light waves will have a preferred direction of oscillation after interacting with the water surface.
The degree of polarisation of light at a water surface is affected by factors such as the angle of incidence, the refractive index of the water, and the surface roughness of the water. A higher angle of incidence, a higher refractive index, and a smoother water surface can result in a higher degree of polarisation.
No, unpolarised light cannot become completely polarised after interacting with a water surface. This is because the polarisation of light at a water surface is always partial due to the random nature of the incident light.
The polarisation of light can affect its visibility underwater as it can result in glare or reflections on the water's surface. This can make it difficult for objects to be seen clearly underwater and can also cause visual distortions. However, polarised sunglasses can help reduce the effects of polarised light and improve visibility underwater.
