An oil flowing on water seems coloured due to interference. For observ – McqOptions

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1.	An oil flowing on water seems coloured due to interference. For observing this effect, the approximate thickness of the oil film should be [DPET 1987; JIPMER 1997; RPMT 2002, 04]
A.	\[100\,\,{AA}\]
B.	\[10000\,\,{AA}\]
C.	1 mm
D.	1 cm
Answer» C. 1 mm

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