An Optical Engineer Needs to Ensure That the Bright Fringes ${~m}$

question 30

Multiple Choice

An optical engineer needs to ensure that the bright fringes from a double-slit are 15.7 mm apart on a detector that is 1.70 ${~m}$ from the slits. If the slits are illuminated with coherent light of wavelength 633 nm, how far apart should the slits be?

• A) 68.5 μm
• B) 74.0 μm
• C) 79.5 μm
• D) 63.0 μm

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