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Binoculars are like two telescopes
mounted side by side. So, how do telescopes work?
At the front of each telescope is a lens—either
an objective or a field lens. This gathers light from whatever it
is you’re looking at. Let’s says you're looking at a bird.
The objective or field lens magnifies the image of the bird, but this
image is upside-down. Not very useful at this point.
If you’re using prism binoculars (and
most likely you are—they’re the most popular kind), a
prism in each tube reverses and inverts the image of the bird. In
field glasses, there’s a second lens instead of a prism.
The light then travels down the tube, and
through a lens in the eyepieces. The bird is magnified even further.
Good binoculars will give you an accurate and detailed look at the
bird. |
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