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[" 27.When white light is incident norma...

[" 27.When white light is incident normally on an oil film "],[" of thickness "10^(-4)cm" and refractive index "1.4" then "],[" the wavelength which will not be seen in the "],[" reflected system of light is "],[[" (1) "7000 AA," (2) "5600 AA],[" (3) "4000 AA," (4) All of these "]]

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