Light rays don't get to the brain. If we see, that's because the nerves transmit signals from our eyes to the brains - but those signals are no longer light rays, they only "represent" light rays.
When light passes through a lens, both the parallel rays of light and the converging or diverging rays of light are refracted. The refraction causes the light rays to converge or diverge, which helps in focusing the image on the retina.
Refraction.
Marginal rays are the light that passes through an optical system that is away from the optical axis.
No, the bending of light rays is not reflection. It is called refraction, which occurs when light passes through different mediums and changes speed, causing the light rays to bend. Reflection involves the bouncing back of light rays off a surface.
When light rays are bent, they are called refracted. Refraction occurs when light passes through different mediums of different optical densities, causing the light rays to change direction.
Refraction of light rays occurs when light passes through a medium with a different optical density, such as glass, causing the light rays to change direction. This bending of light rays is due to the change in speed of light as it moves from one medium to another.
If you are referring to a situation in which light is reflected from water back into the air, then the light rays are "polarized." All light rays travel in straight lines, but polarized light is light that enters a medium from many directions, but are exited (reflected or refracted or merely cut out, like in sunglasses) in one direction.
This is the definition of the reflection of a light ray. The other term related to light rays is refraction, which is the bending of a light ray as it passes from one substance into another.
Spread apart light rays refer to light rays that are moving away from each other, causing them to become more dispersed and cover a larger area. This can happen when light passes through a lens or other optical element that causes the rays to diverge.
When light passes through two erect prisms, the light rays are refracted twice - once when entering the first prism and again when exiting the second prism. This causes the light rays to change direction twice, leading to further dispersion of the different wavelengths.
It doesn't form an image on the eye but in the brain.
Light enters the eye through the cornea, then passes through the pupil, which adjusts its size to control the amount of light. It then travels through the lens, which focuses the light onto the retina at the back of the eye, where it is converted into electrical signals that are sent to the brain via the optic nerve for visual processing.