A 215 nm thin film with indexof refraction 1.68 floats on water (with index of r

Question

A 215 nm thin film with indexof refraction 1.68 floats on water (with index of refraction 1.333). What is the largest wavelength of reflected light for whichconstructive interference occurs?
Answer in units of m. What is the2nd largest wavelength that interferes constructively?
Answer in units of m. A 215 nm thin film with indexof refraction 1.68 floats on water (with index of refraction 1.333). What is the largest wavelength of reflected light for whichconstructive interference occurs?
Answer in units of m. What is the2nd largest wavelength that interferes constructively?
Answer in units of m. What is the2nd largest wavelength that interferes constructively?
Answer in units of m.

Explanation / Answer

We know that the thickness of the thin film is           t = n / ( - ')             From this we have for n = 1           = ( - ') * t             = (1.68 -1.33) * 215 x 10-9 m             = 7.52 x 10-8 m Second longest wavelength = 2 =1.5 x 10-7 m Second longest wavelength = 2 =1.5 x 10-7 m     

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