A thin film of oil (n_o = 1.50) with varying thickness floats on water (n_w = 1.

Question

A thin film of oil (n_o = 1.50) with varying thickness floats on water (n_w = 1.33). When it is illuminated from above by white light, the reflected colors are as shown in (Figure 1). In air, the wavelength of yellow light is 580 nm. When illuminated from above at A, light ray reflected from the air-oil interfaces undergoes A light ray reflected from the oil-water interface undergoes If the oil thickness at A is vegetable compared to the wave length of the light then there significant shift in phase due to a path distance travelled by a ray in the oil. Thus the light reflected from the two surface will therefore for all visible wavelength and the of will appear black when from above

Explanation / Answer

1. has phase shift of Pi

2. has no phase shift

3. "is a"

4. constructively

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