What is lense ?? defination of lense
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Answer:
A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. ... Lenses are made from materials such as glass or plastic, and are ground and polished or molded to a desired shape. A lens can focus light to form an image, unlike a prism, which refracts light without focusing.
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A piece of glass or other transparent material with curved sides for concentrating or dispersing light rays, used singly (as in a magnifying glass) or with other lenses (as in a telescope).there are 2 types of lenses :
1)COCAVE
2)COVEX
Explanation:
Both the lenses have different type of dispersing light ....
CONCAVE = It has thick endings and narrow center, the dispersed rays dosent meet at a point at the back of the lens.
CONVEX = It is narrow in the end and thick in the between,the dispersed rays meets at a point behind the lens.
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