A laser beam of diameter d1 11 mm is directed along the, Ask an Expert

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A laser beam of diameter d1 = 1.1 mm is directed along the optical axis of a thin lens of focal length +6.0 cm (see figure below).

1) How far from the lens will the beam be focused?

2) 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 = 3.9 mm. Thus the combination of lenses acts as a beam expander. Find the focal length of the second lens.

3) Find the distance between the lenses.

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