In comparing the camera and the human eye, the film of the camera function as the?

Analyze the question: The question asks which part of the human eye does the same job as the film in a camera.

Explain the concept: Both the camera and the eye form an image of an object using a convex lens. The image must land on a surface that records or detects it. Here is how the parts compare:

| Camera | Human eye | |---|---| | Lens | Eye lens (and cornea, which does most of the bending of light) | | Diaphragm (aperture) | Iris, which controls how much light enters | | Opening for light | Pupil | | Film (or sensor) | Retina | | Light-tight box | Eyeball (the dark interior) |

Step-by-step solution:

1. Light enters the camera through the lens and is focused to form a real, inverted, diminished image.
2. The image falls on the film, which records it.
3. In the eye, light passes through the cornea, pupil and lens, and the image is formed on the retina.
4. The retina contains light-sensitive cells (rods and cones) that detect the image and send signals to the brain through the optic nerve.
5. So the film is the camera's image-receiving screen, and the retina is the eye's image-receiving screen.

Why the other options are wrong:

• B. Iris: it matches the camera's diaphragm, which controls the amount of light.
• C. Cornea: it is the transparent front covering that helps refract light, so it is like part of the lens system.
• D. Pupil: it is the opening through which light enters, like the camera's aperture.

Answer: The film of the camera functions as the retina, which is option A.

Exam tip: Remember "Film = Retina" as the screen pair, and "Iris = Diaphragm" as the light-control pair. JAMB often asks for these pairings in different forms.