Concave lenses are used in glasses for people who are near-sighted. Convex lenses are used in glasses for people who are far-sighted.
A lense which bulges outwards is a convex lense.Additionally, a lense which bulges in is called a concave lense. You can remember the difference by thinking about the fact that a cave is like an inward bulge in a cliff, and the inward-bulging lenses are concave.
Concave means that there is a dip in the object, like it has caved in. Bi-concave means that it is dipped in on two sides of the object. A good example is a red blood cell. It is a bi-concave disk - it has dips on two sides of it.
The focal length of the lens and the distance between the lens and the object.
Been looking for the same answer myself....
A reflecting telescope is different from a refracting telescope because a reflecting telescope uses a concave lens, a plane mirror, and a convex lens. While a refracting telescope uses two lens.
Convex and concave
You can't directly compare the two classes of lenses like that.What you can say is:-- The middle of a convex lens is thicker than the edge.-- The middle of a concave lens is thinner than the edge.One way to remember it: The middle of a concave lens is caved in.
When concave and convex surfaces come together, they form a lens. The interaction of these two surfaces causes light to either converge (convex lens) or diverge (concave lens), which can be used in various optical devices like cameras, telescopes, and eyeglasses to focus or correct vision.
A convex lens is thicker at the center and thinner at the edges, causing light rays to converge to a focal point. This type of lens is often used in cameras and binoculars. On the other hand, a concave lens is thinner at the center and thicker at the edges, causing light rays to diverge. Concave lenses are commonly used in correcting nearsightedness.
Concave lenses are used in glasses for people who are near-sighted. Convex lenses are used in glasses for people who are far-sighted.
a peep hole, such as you'd find in the door of a hotel room, uses a concave lens to make the image of the person standing in the hallway appear smaller than they actually are.Glasses for nearsighted people.
a convex lens is thicker in the center then at the edges. A convex lens acts like a concave mirror, because it focuses rays of light.
Using a convex lens: When an object is placed between the focal point and the convex lens, the image formed will be virtual, upright, and smaller in size. Using a concave lens: Placing an object further away from the concave lens than its focal point will result in an image that is virtual, upright, and smaller than the object.
A microscope has two lenses called the eyepiece lens and the objective lens. The objective lens is closest to the object being viewed and magnifies it, while the eyepiece lens further magnifies the image formed by the objective lens for viewing by the observer.
Glasses and a peep hole you find in your door
Reflecting TelescopeA reflecting telescope uses a lens and two mirrors. The lens is positioned at the eyepiece, and thus the focus, which the two mirrors generated by specifically redirected light. There are two types of reflecting telescopes with one lens and two mirrors, the Newtonian Focus and the Cassegrain Focus.