define
convex and concave lens and dispersion
Answers
Answer:
convex lens : A lens having at least one convex surface, such that light passing through it may be brought to a focus.
concave lens : A concave lens is a lens that possesses at least one surface that curves inwards
dispersion : the separation of white light into its spectrum according to wavelength.
Explanation:
Explanation:
Lenses are incredibly important to us. In fact, it can be said that lenses have changed our lives as human beings. Without lenses, we would have to rely on our natural eyesight (which would be unfortunate for those of us without 20/20 vision), we wouldn't have any type of photography, and we wouldn't have television or movies. Do I even need to continue this list to prove the point that lenses have made our lives very different?
There are two main types of lenses: convex and concave. Convex lenses often get all the credit. They are the type of lens responsible for magnification and are the most common lens used in photography and other common applications. Concave lenses, though, serve an important role as well...
concave Len:-
A concave lens is any lens that has an inward curve in the middle. In other words, the edges of the lens are thicker than the middle. This causes light that enters the lens to spread out, or diverge. In effect, this makes images appear smaller when viewed through a concave lens.
Light being passed through a concave lens. As you can see, the light is spreading out, or diverging, as it passes through the lens.
convex lens
Convex lenses can form two types of images: real and virtual. A real image is one that is projected in front of the lens and can be captured on a screen. Convex lenses are the only type of lens that can form real images. If you've ever seen a movie in a theater, then you've seen a real image created by a convex lens. Projectors, like those used in movie theaters, use convex lenses to project real images onto screens.
Convex lenses can also form virtual images, the kind you have to look into the lens to see. Many people use eyeglasses to see clearly, and these often have convex lenses. If you're wearing glasses with convex lenses, you are always looking into the lens, so everything you see is actually a virtual image created by your lenses....