You wish to use a lens to focus a beam of light that has a diameter of
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You wish to use a lens to focus a beam of light that has a diameter of \(40.0 \mathrm{~mm}\). Which lens focuses the beam to the smallest point: lens A, 10. 0-mm diameter, \(25.0-\mathrm{mm}\) focal length; lens B, \(150-\mathrm{mm}\) diameter, \(50.0-\mathrm{mm}\) focal length; or lens \(\mathrm{C}, 30. 0-\mathrm{mm}\) diameter, \(30.0-\mathrm{mm}\) focal length?
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