Why do we not see the effects of thin-film interference when looking at the pane

Question

Why do we not see the effects of thin-film interference when looking at the pane of glass in a window? (A) Interference does not happen in thick films. (B) The fringes are too dim. (C) The fringes are too far apart. (D) The bright and dark fringes tend to overlap. 550-nm light strikes a thin film normal to the surface; all of the light is transmitted and none is reflected. A second ray of light of wavelength lambda strikes the same thin film at a very small angle to the normal; all of the light is also transmitted and none is reflected. What can be concluded about lambda? (A) lambda > 550 nm (B) lambda = 550 nm (C) lambda

Explanation / Answer

14. A-(Because the thickness of the film has to be on the order of the wavelength of light)

15. D

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