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Q. 28

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 1018

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Short Answer

A common optical instrument in a laser laboratory is a beam expander. one type of beam expander is shown in FIGURE P.

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

the right?

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

a. Lens spacing d does a parallel laser beam exit from the right .

b. The width of the exiting laser beam is .

See the step by step solution

Step by Step Solution

part(a) Step 1: Given information

We need to find what lens spacing d does a parallel laser beam exit from the right.

part(a) Step 2: Explanation

We find this distance as the sum of the focal length of the first lens and the focal length of the second lens:

part (b) step 1: Given Information

We need to find the width of the exiting laser beam.

part (b) step 2: Simplification

let us find width ,

Here, is the width of the first lens, is the width of the second lens, is the focal length of first lens and second lens.

part (b) step 3: Diagram

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