Question

What is the black circular aperture in our eyes and why does it appear black?
A. The aperture is known as iris and it appears black as no light is reflected from it.
B. The aperture is known as pupil and it appears black as all light is reflected from it.
C. The aperture is known as iris and it appears black as all light is reflected from it.
D. The aperture is known as pupil and it appears black as no light is reflected from it.

Answer 1

Hint: Eyes are part of a sensory nervous system that reacts to light and allows vision. The Iris is a whole physical tissue sited behind the cornea. The pupil isn’t a tangible part of the eye, that's to mention not a structure of the eye. An aperture simply means a little hole.

Complete step by step answer:
The eye is taken into account as an organ for vision in many living things. The eye helps us to navigate the surrounding by feeding us information on the location, color, and movement of an object in most mammals.
The eye is an intricately designed organ, which has many parts functioning in accordance with the aim of this said vision. The parts of the eye include but aren’t limited to the cornea, the lens, the iris, the retina, and the pupil.
The cornea is the first outer layer of the eye, which receives the incoming ray of light and acts to focus it. Non-parallel rays or diverging rays are first made parallel by the cornea so they will be focused properly by the lens.
Right behind the cornea, we have the anterior chamber which holds the fluids produced by the eyes. Right after that sits the iris which is a ring of tissue designed to control the quantity of light incident on the lens by varying the area of the opening of the ring. It also determines the total color of the eye. The whole surrounded by the ring of the iris is termed as the pupil. The pupil appears black due to it has no physical structure and allows light to pass through to be absorbed by the retina after being focused by the lens.

So, the correct answer is “Option D”.

Note: The camera is an invention that works the same as the eye. The diaphragm of the camera is maybe analogous to the iris, the aperture is analogous to the Pupil, the film is the retina, and they both need lenses. However, since the eye is a biological object, the camera is a mechanical one, differences abound.