A layer of oil, with a refractive index of1.40798, 0.92562 mm thick,floats on wa

Question

A layer of oil, with a refractive index of1.40798, 0.92562 mm thick,floats on water. (a) Light of vacuum wavelength 632.800 nm, emitted by a stabilizedHe-Ne laser, is reflected at normal incidence by the oil. How manywavelengths are contained in the light wave passing back and forththrough the oil?


(b) Does the light reflected from the two surfaces of the oilinterfere constructively or destructively?
constructiveinterferencedestructiveinterference (a) Light of vacuum wavelength 632.800 nm, emitted by a stabilizedHe-Ne laser, is reflected at normal incidence by the oil. How manywavelengths are contained in the light wave passing back and forththrough the oil?


(b) Does the light reflected from the two surfaces of the oilinterfere constructively or destructively?
constructiveinterferencedestructiveinterference constructiveinterferencedestructiveinterference constructiveinterferencedestructiveinterference

Explanation / Answer

n = 1.40798, t = 0.92562 mm, = 632.800 nm a) (2nt + /2)/ = 4119.5 b) destructive interference

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