An Optical Engineer Needs to Ensure That the Bright Fringes $15.7 \mathrm {~mm}$

question 116

Multiple Choice

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

• A) \(63.0 \mu \mathrm { m }\)
• B) \(68.5 \mu \mathrm { m }\)
• C) \(79.5 \mu \mathrm { m }\)
• D) \(74.0 \mu \mathrm { m }\)

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