The phenomena of light responsible for the working of the human eye is-

A student lying on the floor near a swimming pool wants to see an object at its bottom surface. The angle of incidence of light from the object on the surface of water is called :

A ray of white light, incident upon a glass prism, is dispersed into its various color components. Which one of the following colors experiences the greatest amount of refraction?

Which among the below set of colours are generally known as the primary colors of light?