Question

(e) Monochromatic light of wavelength 6.3 \times 10^{-7}m in air is incident from above at a normal to the oil layer. Rays on the diagram are shown at near-normal incidence for clarity. Three positions X, Y and Z are shown on the diagram. air 1.00 X Y oil 1.47 water 1.33 (i) Identify, with a reason, a position at which there is a phase change of 180°. .There is will hossackpongse adataigabit X. abedbeschoflat laghtects stating condidomnever thadsunbigher refractive index. (ii) Determine the minimum thickness of the oil layer for which light is not reflected. State your answer to an appropriate number of significant figures.

          (e)
Monochromatic light of wavelength 6.3 \times 10^{-7}m in air is incident from above at a
normal to the oil layer. Rays on the diagram are shown at near-normal incidence for
clarity. Three positions X, Y and Z are shown on the diagram.

air
1.00
X Y
oil
1.47
water
1.33
(i)
Identify, with a reason, a position at which there is a phase change of 180°. 
.There is will hossackpongse adataigabit X. abedbeschoflat laghtects stating condidomnever thadsunbigher refractive
index.
(ii)
Determine the minimum thickness of the oil layer for which light is not reflected.
State your answer to an appropriate number of significant figures.

$(e) Monochromatic light of wavelength 6.3 ×10^-7m in air is incident from above at a normal to the oil layer. Rays on the diagram are shown at near-normal incidence for clarity. Three positions X, Y and Z are shown on the diagram. air 1.00 X Y oil 1.47 water 1.33 (i) Identify, with a reason, a position at which there is a phase change of 180°. .There is will hossackpongse adataigabit X. abedbeschoflat laghtects stating condidomnever thadsunbigher refractive index. (ii) Determine the minimum thickness of the oil layer for which light is not reflected. State your answer to an appropriate number of significant figures.$

Added by James H.

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