The next two questions pertain to the situation described below. A thin film of

Question

The next two questions pertain to the situation described below. A thin film of oil (nojl 1.5) of thickness 1 - 240 nm is floating on top of a puddle of water (n shown in the figure. 1.3) as Hair 20) For which of the following wavelengths 1 (in vacum) of light incident on the filim will destructive interference be observed? a, ?-480 nm b, ? 720 nm c. 624 nm 21) A film of oil of the same thicknesst-240 nm is resting on top of a block of plastic (plastic 1.8). If light of wavelength ? 480 nm s incident on the oil, what type of interference will be observed? a. Destructive b. Constructive

Explanation / Answer

For destructive interference

2*n*d=(2m-1)*lambda

so,

taking m=1,

lambda=2*1.5*240*10^-9

= 720*10^-9 m

= 720 nm

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