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Two sources of light of wavelengths 2500...

Two sources of light of wavelengths 2500 Å and 3500 Å are used in Young’s double slit expt. simultaneously. Which orders of fringes of two wavelength patterns coincide?

A

3rd order of 1st source and 5th of the 2nd

B

7th order of 1st and 5th order of 2nd

C

5th order of 1st and 3th order of 2nd

D

5th order of 1st and 7th order of 2nd

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