00:01
Hello, the question which we have it says, suppose two flat glass plates 30 cm long are in contact along one end and separated by a human hair at other end.
00:14
If the diameter of hair is 50 millimeters, find the separation of interference fringes when plates are illuminated by green light.
00:23
So the wavelength is given 546 nanometers.
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So the wavelength is 546 nanometers.
00:31
So it will be 546 into 10 to the power minus 9 meters.
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And the diameter, the diameter of human here, it is given.
00:46
So that is 50 millimeters.
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So it will be 50 into 10 to the power minus 3 meters.
00:57
So actually it should be micrometers.
00:59
We will solve the problem and then see whether it is micrometer or millimeter...