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

question 77

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