Ẓeṛ aɣbalu n Affa

'''Affa''' (s [[Taglizit|Tegnizt]]: ''Radiance'') d tasmekta n [[tafasa|tfasa]] n [[tafat]] i d-iteffɣen deg yiwet n [[tasint|tsint]] seg 1 cm<sup>2</sup> seg kra n tjumma iteddun ɣer kra n tnila s talɣa taratakt i [[tiɣmert tuntimt|teɣmert tuntimt]].<ref>{{Tanagit s web|aneggar=Palmer|amezwar=James M.|Azwel=The SI system and SI units for Radiometry and photometry|akala=http://www.optics.arizona.edu/palmer/opti400/suppdocs/bkappndx.pdf|akala n ufaylu=https://web.archive.org/web/20120802170633/http://www.optics.arizona.edu/palmer/opti400/suppdocs/bkappndx.pdf|azemz n ufaylu=August 2, 2012| assaɣ yerrẓen = yes }}</ref> Tigget n waffa deg [[Anagraw agraɣlan n tiynin|unagraw agreɣlan n tiggtin]] iga d [[watt]] i yal [[amiter amkuẓ]] i yal [[Stirdyan|ustirdyan]] (W·sr<sup>−1</sup>·m<sup>−2</sup>), anda tajumma (m³) tettili d taratakt deg tnila n tafat

Asegder n tafat deg [[ilem (tasengama)|yilem]] yeṭṭafar tadɣert d tnila. Amedya, Tasfawt (llamba) i d-iberrun i tadla n tafat deg texxamt tamsullest mi ara ad yettwassen wadeg n tesfawt d tnila deg wacu i d-ittak tafat yettak-d tazmert i weglam n tesfawt. Anecta yennumk d akken kra n tajumma meẓẓiyen iwulan ɣer uɣbalu n tafat seg zdat tetteɣlay-d fellas tfasa meqqren s wassaɣ ɣer tjumma ur nwula ara srid i tafat

Seg tsekna tixatarin yakk n waffa d akken iga d imezgi n watig deg uzerrig aɣɣad, dɣa taskent-a tettusemres s tuget deg yisnasen [[Tasemdant|tsekdanin]]. S yis yezmer ad tili tussna n tassast n [[Asefliley|usefliley]] n [[tafukt|tfukt]] d [[itri|yitran]].<br/>
Asumer n tafat d akken-it ur tettwasemdu ara s wammas deg wanda i d-tettenfufud deg-s yettili d imezgi gar n sin n wazagen P<sub>1</sub> d P<sub>2</sub>, atig n waffa yettaǧǧan azag P<sub>1</sub> deg tnila n P<sub>2</sub> yegda atig n waffa i d-ittawaṭen ɣef wazag P<sub>2</sub> seg tnila P<sub>1</sub>.

== Asiden ==

== Ẓeṛ daɣen ==

== Imniren ==
[[Taggayt:Tasengama]]
[[Taggayt:Tisekdanin]]
[[Taggayt:Akat anaffa]]