Q.

An oil flowing on water seems coloured due to interference. For observing this effect, the approximate thickness of the oil film should be

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a

100Å

b

10000Å

c

1 mm

d

1 cm

answer is B.

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Detailed Solution

THICKNESS   of the film should be comparable to wavelength of light
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An oil flowing on water seems coloured due to interference. For observing this effect, the approximate thickness of the oil film should be