Tipos de Lentes

Fonte: http://www.google.com.br/imgres?imgurl=http://cepa.if.usp.br/e-fisica/imagens/otica/basico/cap08/fig04.gif&imgrefurl=http://efisica.if.usp.br/otica/basico/lentes/intro/&usg=__21cXcSiTCDlNkP1aokddlOW2kS8=&h=337&w=347&sz=14&hl=pt-br&start=0&zoom=1&tbnid=LKaI2qLECLYPDM:&tbnh=133&tbnw=137&prev=/images%3Fq%3Dtipos%2Bde%2Blentes%26um%3D1%26hl%3Dpt-br%26sa%3DN%26biw%3D1004%26bih%3D610%26tbs%3Disch:1&um=1&itbs=1&iact=hc&vpx=359&vpy=97&dur=141&hovh=221&hovw=228&tx=145&ty=122&oei=K_C-TI_4KYP48AbZ49TsAg&page=1&ndsp=14&ved=1t:429,r:1,s:0