2) (3 pt) Some light which is coming from the air (n=1) strikes a layer of water (n=1.3) on top of a pool of oil (n=1.5) traveling straight downward. It reflects off and pick up a strong red (700 nm) tint. You wish to determine the thickness (T) of water that would cause this phenomenon. i. The path length difference for the red light is A. 0 B. 0.5T C. T D. 1.5T E. 2T ii. The path length difference for the red light could be equal to A. 0 B. 0.5A C. A iii. with A= A. 470 nm B. 540 nm C. 700 mm D. 910 nm E. 1050 nm