The phenomenon of light refraction

مَثَلُهُمْ كَمَثَلِ ٱلَّذِى ٱسْتَوْقَدَ نَارًۭا فَلَمَّآ أَضَآءَتْ مَا حَوْلَهُۥ ذَهَبَ ٱللَّهُ بِنُورِهِمْ وَتَرَكَهُمْ فِى ظُلُمَٰتٍۢ لَّا يُبْصِرُونَ

Their similitude is that of a man who kindled a fire; when it lighted all around him, Allah took away their light and left them in utter darkness. So they could not see.