question_answer

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