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Posted By hxbfgd - China
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Posted By clzoptics - China
Summary: plano concave lenses convert incoming parallel light rays diverging beams appear

Posted By clzoptics - China
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Posted By clzoptics - China
Summary: triplet lenses index crown element cemented identical meniscus flint elements

Posted By SJLLASER - China
Summary: fused quarts 200nm 2 2um transmittance coefficient thermal expansion makes ideal

Posted By Roslane - India
Summary: lensmeter rlm 08 ocular external reading vertex power 250 step 0 25d upto 10d