n1=1.33; n2=1.5; i=40°; r= ? from snell's law: n1 x sin i=n2x sin r ⇒1.33 x sin 40°=1.5 x sin r ⇒sin r = 0.5700 ⇒r = sin−1 (0.5700) ⇒ r = 34.75
