PART A: Two slits, each 0.08 mm wide, are placed side by side and illuminated wi

Question

PART A:

Two slits, each 0.08 mm wide, are placed side by side and illuminated with light of wavelength 505 nm from a laser. If bright fringe 7 from the 2-slit interference pattern corresponds to dark band 2 of the single-slit diffraction pattern, how far apart are the two slits (center-to-center)?

PART B:

The same two slits, each of 0.08 mm wide, are now illuminated with light of wavelength 553 nm. Which bright fringe from the 2-slit interference pattern now corresponds to dark band 2 of the single-slit diffraction pattern? (Enter a unitless number.)

Explanation / Answer

A) 7/d = 2/a

=> d = 3.5 a = 3.5 x 0.08 = 0.28 mm

B) 7th , no wavelength matter as it is directly proportional for both the distances and will cancel out

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