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Posted By clzoptics - China
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Posted By clzoptics - China
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Posted By clzoptics - China
Summary: meniscus lens convex concave convergent divergent decided refractive index

Posted By clzoptics - China
Summary: spherical lenses curving surface converge diverge light change path affect

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Posted By hxbfgd - China
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Posted By syccooptics - China
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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