How does convex lens in our eyes form erect image of any object?
The image formed on the retina IS inverted. The brain processes the signals received from the retina and we perceive it as non-inverted image. Most of what we think of as vision actual occurs as processing within the visual cortex of the brain. Experiments have been done with individuals wearing special glasses which invert the image before it is focused by the cornea so the the actual retinal image is non-inverted. At first the participants see the world as being inverted. However after an extended period of wearing the glasses, the world becomes right-side up for them again as the brain readjusts its processing of the visual information. When the glasses are removed, a similar period of first inversion then normal perception occurs.
