The lens whose middle part is thicker than edges is
- Convex lens
- Concave lens
- plano concave lens
- plano convex lens
1 Answer
The correct answer is A = Convex lens
Convex lenses are used in eyeglasses for correcting farsightedness, where the distance between the eye's lens and retina is too short, as a result of which the focal point lies behind the retina. Eyeglasses with convex lenses increase refraction, and accordingly reduce the focal length.
The lens which is thick at the middle and thin at the edge is called a convex lens.
When the parallel rays fall on the convex lens, it converges the parallel rays to a pointy after refraction through the lens. So, a convex lens is known as converging lens.
A double convex lens, or converging lens, focuses the diverging, or blurred, light rays from a distant object by refracting (bending) the rays twice. ... This double bending causes the rays to converge at a focal point behind the lens so that a sharper image can be seen or photographed.A convex lens is also called a converging lens because it makes parallel light rays passing through it bend inward and meet (converge) at a spot just beyond the lens known as the focal point. Photo: A convex lens makes parallel light rays converge (come together) at the focal point or focus.