Assume that the width and radius of curvature of a Gaussian beam of wavelength = 1 m, at some point on the beam axis

Assume that the width and radius of curvature of a Gaussian beam of wavelength λ = 1 μm, at some point on the beam axis are W1 = 1 mm and R1 = 1 m, respectively. Determine the beam width W2 and radius of curvature R2 at a distance d= 10 cm to the right.