[tex]n_{st}sini=n_{apa}sinr<=>1,5sin30^o=\frac{4}{3}sinr<=>1,5*0,5= \frac{4}{3}sinr=>sinr=\frac{0,75}{\frac{4}{3} } =0,5625=>r=arcsin(0,5625)=34^o13'\\r=34^o13'\\n_{apa}sin90^o=n_{st}sinl<=>\frac{4}{3}*1=1,5*sinl=>sinl=\frac{4}{3*1,5}=0,8888=>l=arcsin(0,8888)=62^o43'\\l=62^o43'[/tex]
