Modelová Otázka ID 3598 - 
Které z následujících tvrzení správně popisuje mezní úhel?
Správná odpověď je: B
Při šíření světelných paprsků z opticky hustšího do opticky řidšího prostředí dochází k lomu paprsků od kolmice. Mezní úhel αm je úhel dopadu, při němž k lomu světelného paprsku dochází pod úhlem 90°. Jedná se o maximální úhel, u kterého se dá ještě mluvit o lomu světla, neboť při úhlu dopadu vyšším než αm dochází k totálnímu odrazu světla, kdy světlo do opticky řidšího prostředí vůbec nepřechází.
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