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A Soap bubble has a thickness of 90 nm a...

A Soap bubble has a thickness of 90 nm and its refractive index is `mu" = 1.4"`. What colour does the bubble appear to be at a point on its surface closest to an observer when it is illuminated by white light?

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ARIHANT-WAVE OPTICS-All Questions
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  17. In the arrangement shown, S is a point source of monochromatic light. ...

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  18. The refractive index of a medium changes asmu=mu(0)[1-(x^(2)+y^(2))/(d...

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