探究光折射时折射角与入射角的关系，如图所示，使一束光从甲介质斜射入乙介质，测量并记录入射角和折射角大小；改变光束射向O点的角度，进行多次实验，数据如下表所示：                                                                                                                                                           

实验次数	1	2	3	4
入射角	10°	20°	30°	40°
折射角	15.1°	30.7°	48.6°	73.8°