Solution:
Concept: The human eye is a sensory organ that responds to light and allows vision. The experience and vision of conscious light, including colour discrimination and depth perception, is enabled by rod and cone photoreceptor cells.
One of the most significant and sensitive sense organs is the human eye. When you close your eyes, you can't see colors. As a result, the human eye is the most important of all sense organs because it allows us to perceive the beautiful, bright world that surrounds us. The human eye has a mirror-like appearance. On a light-sensitive screen, its lens system creates a picture called the retina. The cornea is a thin layer that allows light to enter the eye. It creates the visible protrusion across the front of the eyeball.
The eyeball is spherical in shape with even a diameter of about 2.3 cm. Most of the refraction for the light rays happens on the outer cornea surface.
The eye is not shaped like a circular circle, but it is a two-piece fused structure, consisting of an anterior segment (front) and the posterior segment (back). The cornea, iris, and lens form the anterior segment. The cornea is translucent and more angled and is connected to the larger rear section, which consists of the vitreous, retina, choroid and the sclera called the outer white shell.
The human eye can distinguish between around 10 million colors, and can detect a single photon. The pupil forms part of the sensory nervous system.
Hence, option 1 is correct.
