3. A laser beam has a diameter of 1 mm. Design a beam expander with two positive lenses to obtain a beam of radius 10 mm.
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The magnification can be calculated using the formula: Magnification = Final beam diameter / Initial beam diameter In this case, the final beam diameter is 2 times the final beam radius (since the diameter is twice the radius), so the magnification can be Show more…
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Two positive lenses are to be used as a laserbeam expander. An axial 1.0 -mm-diameter beam enters a short focal length positive lens which is followed by a somewhat longer focal length positive lens from which it emerges with a diameter of $8.0 \mathrm{mm}$. Given that the first lens has a $50.0 \mathrm{mm}$ focal length, determine the focal length of the second lens and the separation between the lenses. Draw a diagram.
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