Search and compare thousands of words and phrases in British Sign Language (BSL). The largest collection online.
How to sign: a transparent optical device used to converge or diverge transmitted light and to form images
Categories: optical device
Within this category: anastigmat, anastigmatic lens, camera lens, compound lens, condenser, contact, converging lens, crown lens, diverging lens, eyepiece, field lens, Fresnel lens, intraocular lens, monocle, objective