A glass plate (11 = 1.56) is covered with a. thin, uniform layer of oil (11 = 1.29). A light beam of variable wavelength from air is incident normally on the oil Surface. Observation of the reected beam shears constructive interference at 666 nm. Determine the minimum non-zero thickness of the oil lm. (in 11111) 23. A0 3.47 x 101 B0 1.23 x 102 CO 1.78 x 102 DO 2.53 x 102 E0 3.74 x 1132 F0 5.43 x 102 G0 7.37 x 102 HO 1.14 x 103