At the focal point the beam width is ______.

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Multiple Choice

At the focal point the beam width is ______.

Explanation:
Focusing causes energy to converge to a small spot, so the beam reaches its smallest cross-section at the focal point. As the waves travel toward the focus, their width narrows; at the focus it is the narrowest (in practice, diffraction sets a finite minimum size). Beyond the focal point the beam begins to spread again. So the beam width at the focal point is the narrowest.

Focusing causes energy to converge to a small spot, so the beam reaches its smallest cross-section at the focal point. As the waves travel toward the focus, their width narrows; at the focus it is the narrowest (in practice, diffraction sets a finite minimum size). Beyond the focal point the beam begins to spread again. So the beam width at the focal point is the narrowest.

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