A 4.0 × 10 2 -nm thick film of kerosene( n = 1.2) is floating on water. White li

Question

A 4.0 × 102-nm thick film of kerosene(n = 1.2) is floating on water. White light is normallyincident on the film. What is the visible wavelength inair that has a maximum intensity after the light is reflected?Note: the visible wavelength range is 380 nm to750 nm.

a. 380 nm
b. 430 nm
c. 480 nm
d. 530 nm
e. 580 nm A 4.0 × 102-nm thick film of kerosene(n = 1.2) is floating on water. White light is normallyincident on the film. What is the visible wavelength inair that has a maximum intensity after the light is reflected?Note: the visible wavelength range is 380 nm to750 nm. 380 nm 430 nm 480 nm 530 nm 580 nm

Explanation / Answer

Thickness t = 4.0 × 102-nm refractive index of kerosene n = 1.2 we know for maximum intensity t = / n from this wavelength = nt                                    = 480 nm So, the answer is option ( c )

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