Are you avid about watching birds? Are you on a safari to the deep jungle to see those animals in their real life situation? Are you on a picnic to a hill station? Are you an ardent fan of watching those galloping horses in a race course? Rather than watching the cricket you love to watch the game live in the stadium? You are surprised by the number of stars you see on a distinct night sky and wondered how you could see them a bit greater? Then there is one issue you should remember to hold with you for a apparent and bigger picture of what you see afar. That is the binoculars.
Ever wondered how does a pencil, immersed in a water, look like as if the part immersed in the water is somewhat bend to one side and is little larger ? That is because though the surface of water in a translucent glass is apparently straight, it is slightly curved, which is called meniscus. The same principle is concerned in binoculars. The lens used in the binoculars is curved and is thicker in the middle (called convex in physics), so light rays coming from the far away items make a focused image on the lens. But there is a hitch; such images passing through the contact lenses make a cross over and seen as upside down. So you will ask how do we get the larger strait picture rather than an upside down image?
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