Question

In similarity with a photographic camera, the retina acts as
(a) Shutter
(b) Lens
(c) Diaphragm
(d) Film

Answer 1

The retina serves a function analogous to that of the image sensor in a camera. On a photographic plate, conventional cameras catch the light. The retina does not have an aperture-like effect. The amount of light entering is also not controlled by it. They are not responsible for capturing light from the subject.

Complete step by step answer:
In a photographic camera, the picture on the film is created. Similarly, in the eye, the picture is created on the retina which is the light-sensitive surface in the eye. The retina aims to receive light focused by the lens, translate the light into neural signals, and transmit these signals for visual recognition to the brain. The light rays penetrate the eye through an aperture called the pupil. The biconvex eye lens concentrates the light rays on the retina and an image is created. Both the camera and eye can control the amount of light for image creation.
At the back of the eye, the retina sits and gathers the light absorbed from the surrounding atmosphere to form the image. Either film or sensors in digital cameras carry out the same role on the camera. This approach underpins both how cameras operate and how the eyes work.

So, the correct answer is, ‘(d) Film’.

Additional information: The cornea seems to be the “cap” of the eye. This transparent structure lies to the front of the eye and has a spherical curvature. The camera's lens is also transparent and sits in front of the body. Like the cornea, the lens also retains a spherical curvature.
The iris is within the anterior chamber. This is the eye component that is responsible for the color of one's eye. It functions like a camera's diaphragm, dilating, and constricting the pupil to allow the eye to have more or less light.
One of two means of controlling the amount of light entering the camera is the shutter, along with the aperture. The shutter specifies the time that the light-sensitive surface is exposed to light.

Note: The morphology of the camera carries more resemblances to a biological eyeball than most of us imagine, including the lens-like cornea and the film-like retina. The retina is a thin tissue layer that covers the inside of the back of the eye. It is positioned next to the optic nerve. Photoreceptor cells are the main light-sensing cells in the eye, which are of two kinds: rods and cones.
- Rods work predominantly in dim light and provide vision in black and white.
- Cones work in well-lit environments and are responsible for the perception of color, as well as high-acuity vision used for activities such as reading.