the pupil that is why it gets smaller in the light
The lens
An eye is a complex structure and essentially all parts of the eye are required for vision to occur. However the part of the eye which detects the focused (by the lens) light image is the retina.
The reason why shadows only go on one corner is because the light source is not focused on that specific spot (light rays do not touch that part of the eye).
The retina
It will be right to say that only principles of light microscopy keeps light focused and scatters wavelengths of visible light for the human eye to see.
A laser is a beam of very strong and focused light. It is possible for this light to damage the retina of your eye permanently, and you will lose all or part of your vision.
No part of the eye "attracts" light. Light enters the eye by passing through the cornea and the aqueous humour before getting to the lens. After being focused by the lens, light passes through the vitreous humour to the retina.
The part of the eye that reacts to light is the retina.
As light enters the eye, it passes through the cornea and the lens and is eventually focused onto the retina.
The Lens is the part of the eye that bends light rays .
The pupil is the part of the eye through which light passes.
when light enters the eye it passes through the cornea then pupil then the lens where it is bent and focused on the retina