Explain how we perceive objects as they are.


Light coming from an object enters the eye through the cornea and pupil. The eye lens converges these light rays to form a real, inverted and diminished image of the object on the retina. The light sensitive cells of the retina get activated when light falls on them; they then generate electrical signals. These electric signals are sent to the brain by the optic nerves. The brain interprets the electrical signals in such a way that we see an image which is erect and of the same size as the object.