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Chapter 35: Q.29 (page 1018)

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 ray of a laser beam of width 蝇1enter from the left.

a. For what lens spacing d does a parallel laser beam exit from the right?

b. What is the width 蝇2of the exiting laser beam?

Short Answer

Expert verified

a.)d-f2+f1

b.)蝇2-f2

Step by step solution

01

Step.1 Given information

a.)From the given values shown in FIGURE

d=f2-f1

If f1<0,this equationto

02

Step 2. Explanation

b.) we need to find width 蝇2

From triangles picture, we get Value of 蝇2

蝇1f1=蝇2f2

鈬�蝇2=f2f1蝇1

So, if isf2>f1and our answer then shows is 蝇2>蝇1

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