Hom looj tsom iav hom-CR39 lens

CR39 yog cov khoom siv txheej txheem, lub npe tshuaj: allyl diglycol carbonate, yog cov khoom siv dav tshaj plaws hauv kev tsim cov iav zoo tib yam. Tshawb pom los ntawm Columbia, Tebchaws Asmeskas xyoo 1940, nws yog cov khoom 39th hauv cov khoom siv polymer uas tsim los ntawm Tebchaws Meskas Cov Tub Rog. Ib feem hu ua CR39, nws cov khoom ua rau nws haum rau cov iav qhov muag nrog qhov ntsuas qhov ntsuas ntawm 1.5, ntom ntom 1.32, Abbe tus lej 58-59, cuam tshuam tiv taus thiab lub teeb kis tau zoo, thiab tuaj yeem zas xim thiab txheej. Nws qhov tsis zoo tseem ceeb yog tias nws tsis hnav zoo li iav thiab xav tau kom tsis txhob xau nrog cov yeeb yaj kiab tiv taus rau txheej txheej. Ib qho ntxiv, cov iav lo ntsiab muag kuj tseem tuaj yeem ua tiav los ntawm kev tsim qhov nkhaus ntawm lub lens nto, ua rau lawv zoo tagnrho rau kev tsim cov tsom iav qhov muag.