Xov xwm kev lag luam
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Keeb kwm ntawm Spotting Scope
Nyob rau hauv 1611, tus German astronomer Kepler coj ob daim ntawm lenticular lens raws li lub hom phiaj thiab lub eyepiece, lub magnification yog obviously txhim kho, tom qab cov neeg suav hais tias qhov kho qhov muag system li Kepler telescope.Xyoo 1757, Du Grand los ntawm kev kawm ntawm iav thiab dej refraction thiab dispersion ...Nyeem ntxiv -
Yuav xaiv lub tsom iav li cas
Yuav ua li cas xaiv lub tsom iav raj yog ib qho nyuaj, nws tsis yog tsuas yog cov khoom siv tswv yim xwb, tab sis kuj yog ib qho khoom siv kim heev, feem ntau ntawm cov neeg nyob rau hauv qhov xwm txheej ntawm cov khoom noj khoom haus nplua nuj, xaiv nws ua cov cuab yeej ua si lom zem.Mus koom kev ua si sab nraum zoov, saib kev ua kis las, saib cabaret, ...Nyeem ntxiv