Question

'Human eye is like a camera'. Justify the statement.

Answer 1

There are many similarities between the human eye and a camera, including a diaphragm to control the amount of light that gets through to the lens. This is the shutter in a camera, and the pupil, at the centre of the iris, in the human eye. A lens to focus the light and create an image. The image is real and inverted. A method of sensing the image. In a camera, the film is used to record the image; in the eye, the image is focused on the retina, and a system of rods and cones is the front end of an image-processing system that converts the image to electrical impulses and sends the information along the optic nerve to the brain. The way the eye focuses light is interesting because most of the refraction that takes place is not done by the lens itself, but by the aqueous humour, a liquid on top of the lens. Light is refracted when it comes into the eye by this liquid, refracted a little more by the lens, and then a bit more by the vitreous humour, the jelly-like substance that fills the space between the lens and the retina.