??????????-??????????-????-??????-????????-???????-?????????????????????????????????????????????????? ????????????( ; ; )??? ?? ???? ??? ?? ???? ?????, ? ?? ???? ??? ? ??? ???????.??? ????? ?? ?????? ?? ?? ??? ????, ?? ??? ??? ?????.five°) cannot be neglected when compared with the width of a rainbow (2°). The quantity of colour bands of a rainbo