Waa maxay muraayad fidsan (dispersive prism)?
Context:Waxyaabaha la yiraahdo "dispersive prism" waa waxyaabo la yiraahdo "optical prism" oo loo isticmaalo in lagu kala saaro iftiinka, taas oo ah, in la kala saaro iftiinka qaybaha muuqaalkiisa (midabada qaansoroobaadka). Iftiinka dhererkiisu (midabkiisu) kala duwanaa wuxuu ka soo jeedaa xaglo kala duwan. Tani waxay sabab u tahay in qiimeynta wax soo saarka ee prism ay ku kala duwan yihiin dhererka mawjadaha (faafin). Guud ahaan, dhererka hirarka dheer (casaan) waxay leeyihiin kala duwanaansho ka yar dhererka hirarka gaaban (buluug). Iftiinka cad ee midabada kala duwan leh ee ku kala baxa muraayada ayaa keenay in Sir Isaac Newton uu gaaro gabagabada in iftiinka cad uu ka kooban yahay midabyo kala duwan oo isku dhafan.
Qalabka kala firdhinta (dispersive prism) waa qalab indhaha oo kala firdhiya dhererka hirarka iftiinka ee kala duwan ee dhinacyada kala duwan. Marka iftiinka cad la mariyo shaashad kala go'aysa waxay u kala go'aysaa midabada kala duwan ee qaansoroobaadka.