A common optical instrument in a laser laboratory is a beam expander. One type of beam expander

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A common optical instrument in a laser laboratory is a beam expander. One type of beam expander is shown in FIGURE P35.29. The parallel rays of a laser beam of width w1enter from the left.

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a. For what lens spacing d does a parallel laser beam exit from the right?b. What is the width w2 of the exiting laser beam?

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