A cikin na'urori masu gani, za a iya amfani da yanki na gilashi ko wasu kayan da aka yanke a madaidaicin kusurwa da jirgin sama don yin nazari da nuna haske.Lokacin da haske ke motsawa daga wannan matsakaici zuwa wancan, saurin ya canza, hanyar hasken yana lanƙwasa, kuma wani ɓangare na hasken yana nunawa.Wani lokacin kawai surfa...
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