An Optical Engineer Needs to Ensure That the Bright Fringes $1.70 \mathrm {~m}$

question 75

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 $1.70 \mathrm {~m}$ 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 ?m
• B)74.0 ?m
• C)79.5 ?m
• D)63.0 ?m

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