Question

the colour of the oil film on the surface of water continuously changes why??​

Answer 1

ℏḙʏᾰ

the colour of the light reflected by the oil film depends upon its thickness is the thickness of old film changes continuously and hence the maximum and minimum of different colours also changed continuously that is why colour of the all film on the surface of water continuously changes .

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Answer 2

The location of the bright and dark fringes produced by the thin oil film depends upon the thickness of the film.