When the rectangular metal tank in the gure is lled to the top with an unknown liquid, obServer O, with eyes. level with the top of the tank, can just see corner E. A raythat refractS toward 0 at the top surface ofthe liquid is shown. If D = 100.1 cm and L = 2.27 m, what is the index of refraction of the liquid? : Norma] to liquid surface Number n Units. V