Lasers are classified according to the eye-damage danger they pose. Class 2 lasers, including many laser pointers, produce visible light with no greater than 1 mW total power. They’re relatively safe because the eye’s blink reflex limits exposure time to 250 ms. Find
(a) the intensity of a 1-mW class 2 laser with beam diameter 1.0 mm,
(b) the total energy delivered before the blink reflex shuts the eye,
(c) the peak electric field in the laser beam.