Kivuli : Tofauti kati ya masahihisho

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==Aina za vivuli==
Kama chanzo cha nuru kinafanana na nukta kivuli ni kali yaani kuna kivuli kamili tu kinachokaribia rangi nyeusi. Tofauti kati ya kivuli na eneo lenye nuru ni kali kama mstari uliochorwa. Lakini kama chanzo cha nuru ni pana zaidi kuna ngazi mbili za kivuli yaani kivuli kamili (''[[ing.:en:umbra]] ''umbra'') na nusu kivuli (ing. ''[[:en:penumbra|penumbra]]''). Kati ya nusu kivuli na maeneo yenye nuru mpaka si kali tena.
[[Picha:WayangKulit Scene Zoom.JPG|thumb|Mchezo wa Kivuli huko [[Bali]], [[Indonesia]]]]
Hali ya nusu kivuli inatokea pia kama gimbe lilelile linaangazwa na vyanzo viwili vya nuru.