The following are parts of the eye I. Retina II. Pupil III. Iris The correct equivalent in the camera in the same order are

Analysis

To solve this question, we need to compare the biological structures of the human eye with the mechanical components of a camera. Both systems function on the principle of capturing light to form an image.

Concept Explanation

• Retina: In the eye, the retina is the light-sensitive layer at the back where the image is formed. In a camera, the film (or the digital sensor) serves this exact purpose.
• Pupil: The pupil is the opening in the center of the iris through which light enters the eye. In a camera, the corresponding opening that allows light to pass through is called the aperture.
• Iris: The iris is the colored part of the eye that controls the size of the pupil, thereby regulating the amount of light entering the eye. In a camera, the diaphragm (or iris diaphragm) is the adjustable mechanism that controls the size of the aperture.

Step-by-Step Solution

1. Match I (Retina): The retina is the screen where the image is captured. The equivalent in a camera is the Film.
2. Match II (Pupil): The pupil is the hole/opening for light. The equivalent in a camera is the Aperture.
3. Match III (Iris): The iris controls the size of the opening. The equivalent in a camera is the Diaphragm.

Following the order given in the question (Retina, Pupil, Iris), the corresponding camera parts are: Film, Aperture, Diaphragm.

Comparing this to the options provided:

• A: Diaphragm, Aperture, Film (Incorrect)
• B: Aperture, Diaphragm, Film (Incorrect)
• C: Film, Diaphragm, Aperture (Incorrect)
• D: Film, Aperture, Diaphragm (Correct)

Exam Tip

Think of the Iris as the Diaphragm because they both act like a "curtain" or "shutter" that adjusts size. The Pupil is just the "hole" (Aperture) created by that curtain. Remembering that the Retina is the "Film" is usually the easiest part to start with!