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What is the path difference between interference fringes, when krypton 86 is used?

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What is the path difference between interference fringes, when krypton 86 is used?

(a) 500 mm

(b) 800 mm

(c) 1000 mm

(d) 1200 mm

The question was posed to me in an internship interview.

I'm obligated to ask this question of Wavelength Standard in division Standards of Measurements of Engineering Metrology

1 Answer

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Best answer
The correct choice is (b) 800 mm

The best explanation: Next to laser, Krypton 86 enables maximum path difference i.e. 800 mm between fringes.

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