Question

The image formed on retina of the human eye is ______
A. virtual and inverted
B. virtual and erect
C. real and erect
D. real and inverted

Answer 1

Hint: The lens of the human eye is convex that mainly focuses on the light rays that path through it to create an image. The lens which is also convex further focuses the light so that it will hit the retina at the back of the eyeball that forms the image.

Complete answer:
The human eye enables us to see:
-Light Rays enter the eye through the cornea. It acts as the front covering of an eye or the shield of an eye to protect it from the entrance of foreign particles and the process of refraction begins in the cornea.
-The cornea and lens of an eye together from the real image on the retina when light passes into the eye, it passes first from the cornea since it has a curved surface and acts as the convex, it begins to focus on the light rays.
-The light then passes over the pupil and hits the lens of the eye.
-The lens which is also convex further focuses the light so that it will hit the retina at the back of the eyeball that forms the image. The image that is formed on the retina is real and inverted. The retina comprises specialized cells that are sensitive to light also known as rod and cone cells.
-Both the cells get stimulated and send signals to the brain which turns them into erect images that allow us to see.
-Then the light Rays pass through the pupil, it controls the intensity of light entering the eye, and then the light Rays pass through the convex lens.
-Then the refracted Rays pass through a dense substance This substance is like a gel and is present in the eyeball. And finally, the image on the retina of an eye is formed.
-The retina acts as a screen used to capture images and then this image is converted into electrical signals that are sent to the brain. The images reflected from the convex lens are real.
-Thus real images are formed under the retina of the human eye.

Hence, the correct answer is option (D).

Additional information:
There are two types of lenses
Convex lens: Also called as a converging lens.
Concave lens: Also called a diverging lens.

Note: If a concave lens was used in place of a convex lens inside the human eye, then the image formed would be virtual. But in the human eye, a convex lens is present which leads to the formation of a real image. A common vision condition that occurs when the focus of the image is in front of the retina is nearsightedness and is commonly known as myopia.
In this defect, close objects appear clear but distant objects are blurry. Farsightedness is a vision defect that occurs when the image of the focus is behind the retina and also known as hypermetropia in these different distance objects are seen fine but closer objects appear blurry.