Find the minimum thickness of a soap film (n = 1.333) in which 550-nm light will undergo constructive interference.
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- Interference takes place when two light waves meet. Depending on the path difference the net intensity will decrease or increase.
- When the intensity is reduced it is called destructive interference and when the intensity is increased it is called constructive interference.
- Condition for constructive interference for a film of given refractive index and thickness is given by,
Here n is the refractive index of the film, d is the thickness, m is the order, and λ is the wavelength of the source.
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