PURBIN

PURBIN, asbobi optikiest, ki az linzai dar du tarafash barjasta iborat buda, baroi kalon karda nishon dodani ashyo tain shuda­ast. Masofai fokalii linza har qadar khurd boshad, Purbin tasvirro ha­mon qadar kalon karda nishon medihad. Vale dar amaliya masofai fonaliro baso khurd kardan imkonnopazir ast. Binobar in dar Purbin tasviri jismhoro az 1,5 to 400 marotiba kalon karda didan imkonpazir megardad.

Ad.: Elementarniy uchebnik fiziki, t. 3, M., 1971.