Question

describe refraction of light in a binocular.

Answer 1

The way light bends when it goes from air to a different material (such as water or glass) is called refraction. (For a full explanation of how it works, please see our detailed article on light.) Refraction is the key to how lenses work—and lenses are the key to binoculars, telescopes, and glasses. But how do we get from light bending in water to a cool pair of binoculars that let us study the moon?

Water sitting in a glass appears to have a straight upper edge, even though it is very slightly curved (the curved edge has a special name: it's called a meniscus). If you place a glass on top of a newspaper and look straight down, the news print looks just the same as normal. That's because the top of the water is effectively straight. But if the water had a curved upper surface, the news print would look magnified. You can see this for yourself by trying the simple activity "Make a water lens" in our main article on lenses.

Answer 2

The way of light bends when it goes from air to a different materials is called refraction of light .
Refraction is the key to how lenses work and lenses are the key to binocular.
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