[单选题]
When a light ray enters a denser medium and g9x 40/yobv8jreh 4nx refracts, some of the chujzevbq w5g( p:fr- r*v/l/t cst;u+,aracteristics of5/c;v tgfz :u e(jsl+r,tr/ uvb-q*pw the wave will change. Which of the following options is correct about this change?