A carbon dioxide laser produces $10.6\mathrm{\mu }\mathrm{m}$ electromagnetic waves, which pass through a circular aperture with diameter $1.0\mathrm{mm}$. What is the approximate width of the laser beam when it strikes a target $3.0\mathrm{m}$ away?

• A. $12\mathrm{cm}$
• B. $15\mathrm{cm}$
• C. $19\mathrm{cm}$
• D. $22\mathrm{cm}$
• E. $26\mathrm{cm}$
• F. $7.8\mathrm{cm}$