So i'm building an optical instrument and it's a pair of binoculars. I just smashed open a pair of binoculars from the dollar store and put them back together. But this is weird... there are no prisms but the image is upright.
I thought the binoculars had to have a prism for an upright image but for some reason it doesn't! What happened? Please help!
I thought the binoculars had to have a prism for an upright image but for some reason it doesn't! What happened? Please help!
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These "binoculars" were probably "opera glasses." These use Galileo's original design: a convex objective lens and a concave eyepiece lens. Unlike all later designs, this produces an upright image and doesn't require prisms to erect the image. Its down side is a very narrow field of view. That's why you only find it in very low magnification devices like opera glasses.
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the are the type Galileo used in his designs
the eyepiece lens is concave and gives upright views
but is only good for low powers and in cheap instruments
the eyepiece lens is concave and gives upright views
but is only good for low powers and in cheap instruments
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You need refractormatic