対たい物ぶつレンズ

noun

objective lens

Technical term in optics; the lens closest to the object being observed, used in microscopes, telescopes, cameras, etc.

• 顕けん微び鏡きょうの対たい物ぶつレンズを交こう換かんして倍ばい率りつを上あげた。

  I changed the microscope's objective lens to increase the magnification.