Investigators measure the size of fog droplets using diffraction of light. A camera records the diffraction pattern on a screen as the droplets pass front of a laser, and a measurement of the size of central maximum gives the droplet size. In one t$,$ a $690$nm laser creates a pattern on a screen$$ cm from the droplets. If the central maximum of the pattern is $0\mathrm{.}24$cm in diameter, how large is the droplet?

Express your answer with the appropriate units.

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