A laser used in eye surgery emits a 3.60-mJ pulse in 1.00 ns, focused to a...

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A laser used in eye surgery emits a 3.60-mJ pulse in 1.00 ns, focused to a spot 25.0 um in diameter on the retina. (a) Find (in SI units) the power per unit area at the retina. (This quantity is called the irradiance.) W/m (b) What energy is delivered per pulse to an area of molecular size (say, a circular area 0.700 nm in diameter)? A laser used in eye surgery emits a 3.60-mJ pulse in 1.00 ns, focused to a spot 25.0 um in diameter on the retina. (a) Find (in SI units) the power per unit area at the retina. (This quantity is called the irradiance.) W/m (b) What energy is delivered per pulse to an area of molecular size (say, a circular area 0.700 nm in diameter)?