The relations are

and

Spot Size. A Gaussian beam of Rayleigh rangez,-50 cm and wavelength =488nm is converted into a Gaussianbeam of waist radius Wo using a lens offocallength f 5 cm at a distance z from its waist. Write a computer program to plot Wo' as a function of z. Verify that in the limit z - f>>zo, the relations (as follows) hold; and in the limit z >zo, the relations (as follows) hold; and in the limit z