Which of the following is the lens of the eye?

The correct answer is Biconvex

Explanation:

• The lens, in the human eye, is a translucent structure that focuses light entering the eye on the retina.
• It is located behind the iris of the eye.
• The lens is made up of rare elongated cells that receive nutrients from the surrounding fluids, mostly the aqueous humor that bathes the lens's front.
• A single layer of epithelial cells and a membrane that surrounds the whole organ make up the lens's outer edge.
• The lens is biconvex and ellipsoid in form.
  • An ellipsoid is a sphere that has been extended out like an olive,
  • It is biconvex, meaning it has been rounded outward on both sides.
  • It is biconvex so that, the light rays entering the eye are fine-tuned and converged at a single point on the retina and a clear image is formed. 
• The lens concentrates the light rays that move through it (and onto the retina) to produce transparent images of objects at different distances.
• Ciliary muscles regulate the curvature of the lens, which is flexible.

Other Options:

• Concave: A concave lens is curved inward on both sides. It diverges light rays and is not used in the human eye lens. Instead, concave lenses are often used in glasses to correct myopia (nearsightedness).
• Biconcave: A biconcave lens is curved inward on both sides and also diverges light rays. Similar to the concave lens, it is not used in the human eye lens and is instead used in applications like correcting certain vision problems.