why dont we see interference fringes when light shines through a window?

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Physics

why dont we see interference fringes when light shines through awindow?

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To determine the thickness required to cause thinfilm interference both in light and in oil or soap bubbles you rely on the following equations 2ndcosm 2ndcosm12 These being the equations for constructive and destructive interference According to the math these films can have almost any thickness As said in the comments your reflecting medium needs to have a thickness comparable to the wavelength of light This is not reflected in the equations above    See Answer
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