A layer of colourless oil spreads on water surface. White light is incident on it

A layer of colourless oil spreads on water surface. White light is incident on it and due to interference the oil appears coloured. In order to observe this effect the thickness of oil layer must be of the order of

Options

(a) 100Å
(b) 10000Å
(c) 1 mm
(d) 1 cm

Correct Answer:

10000Å

Explanation:

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