A laser beam of diameter d1 = 1.4 mm is directed along the optical axis of a thin lens of focal length +4.7 cm
(b) A second positive lens is placed to the right of the first. Light emerges from the second lens in a parallel beam of diameter d2 = 3.1 mm. Thus the combination of lenses acts as a beam expander. Find the focal length of the second lens.
A. Assuming the laser beam consists of parallel rays, the beam converges at f1, 4.7 cm from the first lens.
B. After the beam converges it diverges. When it diverges to 3.1 mm it is f1*3.1/1.4 = 10.407 cm from the convergence point. Another lens placed at that location with f2 = 10.407 cm will reestablish a parallel beam of 3.1 mm diameter.
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