In case the beam of light is not orthogonal (or relatively typical) to your boundary, the modify in wavelength results in a transform in the path from the beam. This variation of direction is known as refraction.?? ????? ????? ???? ????? ?????? ???? ? ?? ???? ??? ???? ???? ?? ???? ?????? ?? ?????? ???????? ????? ? ???? ????? ???? ( ?????? ????? ???