ऑफ कॉनकेव लेंस इन द फॉलोइंग डिवाइस स्पेक्टाकल्स मेडिकल डिवाइस
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Spectacles. ... A concave lens -- also called a diverging or negative lens -- has at least ... the use of one or more concave lenses inside the device which minimizes the ...
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