A laser used in eye surgery emits a 3.50 mJ pulse in 1.00 ns, focused to aspot 4

Question

A laser used in eye surgery emits a 3.50 mJ pulse in 1.00 ns, focused to aspot 45.0 µm in diameteron the retina. (a) Find (in SI units) the power per unit area at the retina. (Thisquantity is called the irradiance.)
W/m2

(b) What energy is delivered per pulse to an area of molecular size(say, a circular area 0.600 nmin diameter)?
J (a) Find (in SI units) the power per unit area at the retina. (Thisquantity is called the irradiance.)
W/m2

(b) What energy is delivered per pulse to an area of molecular size(say, a circular area 0.600 nmin diameter)?
J

Explanation / Answer

I=P/A=(3.5*10-3/1*10-9)/(*22.52)=2.2*103W/m2 E=I*A=2.2*103*0.3*10-9J Hence we get by it. E=I*A=2.2*103*0.3*10-9J Hence we get by it.

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