Q.

In a Young’s interference experimental arrangement ,the yellow light is composed of two wavelengths  5890A0 and 5895A0. The distance between the two slits is 10–3m and screen is placed 1 m away. Upto what order can fringes be seen?

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a

339

b

589

c

280

d

440

answer is A.

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Detailed Solution

When the maxima of one wavelength coincides with minima of the other, the fringes will disappear ymax = ymin
n(5895)Dd=n+125890Dd n=589 
Hence fringes will be visible upto 589 order of wavelength 5895A0

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