Why are convex and concave lenses important in optics?
lens is a device that transmits or refracts light. The surface of the lens can be convex, in which case it bulges outwards, or concave, which means that it curves inwards.
Convex lenses are thicker at the middle. Rays of light that pass through the lens are brought closer together. They are said to converge, and so, a convex lens is also called a converging lens.
Concave lenses are thinner at the middle. Rays of light that pass through the lens are spread out, and are said to diverge. So, a concave lens is also a called diverging lens.
Lenses are important in a variety of optical instruments, ranging from microscopes and telescopes, to spectacles for young and old.
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