某介質對空氣的全反射臨界角是,則當光從此介質射向空氣時的全偏振角為:()
A.30° B.45° C.57° D.60°
A.0° B.33° C.57° D.69°
A.arctg4/3 B.arctg3/4 C.arcsin4/3 D.arcsin3/4