In many applications, it is necessary to expand or decrease the diameter of a be

Question

In many applications, it is necessary to expand or decrease the diameter of a beam of parallel rays of light, which can be accomplished by using a converging lens and a diverging lens in combination. Suppose you have a converging lens of focal length 17.8 cm and a diverging lens of focal length -12.5 cm. (a) How can you arrange these lenses to increase the diameter of a beam of parallel rays? Have the beam pass through the Select lens first then the other lens. (b) By what factor will the diameter increase?

Explanation / Answer

We do it by letting the beam pass through the DIVERGING LENS first. [ANSWER]

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It will increase by a factor of

f/f' = 17.8/12.5 = 1.424 [ANSWER]

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