LE “AUREOLE” INTORNO ALLE SORGENTI DI LUCE
Abbiamo già visto nel capitolo “Le sorgenti luminose” che quando rivolgiamo lo sguardo verso il sole o (più prudentemente) verso una lampadina, vediamo comparire qualcosa che assomiglia ad un abbozzo di raggi. Attorno alla sorgente, che fissiamo con gli occhi istintivamente socchiusi per proteggerci dall’abbagliamento, si forma una specie di alone luminoso, all’interno del quale si formano dei cerchi concentrici animati da una lenta pulsazione, attraversati da alcuni raggi colorati.
Abbiamo anche visto come i pittori e i bambini cerchino di rappresentare questa sensazione luminosa, disegnando delle aureole o dei corti raggi luminosi intorno alla sorgente.
Questo fenomeno ( dovuto, probabilmente, ad effetti di diffrazione prodotti dal restringimento della pupilla) può sicuramente concorrere a suggerire l’idea di raggi luminosi rettilinei, ma bisogna ammettere che si tratta di raggi troppo corti, per poter spiegare l’illuminamento di oggetti molto lontani dalla sorgente.
Occorrerà trovare qualche altra prova più convincente di questa capacità dei raggi luminosi di propagarsi nello spazio a grande distanze e di farlo seguendo una linea retta.
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