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A telescope has lenses with focal lengths f1 = +30.0 cm

Chapter 27, Problem 72P

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QUESTION:

Problem 72P

A telescope has lenses with focal lengths f1 = +30.0 cm and f2 = +5.0 cm. (a) What distance between the two lenses will allow the telescope to focus on an infinitely distant object and produce an infinitely distant image? (b) What distance between the lenses will allow the telescope to focus on an object that is 5.0 m away and to produce an infinitely distant image?

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QUESTION:

Problem 72P

A telescope has lenses with focal lengths f1 = +30.0 cm and f2 = +5.0 cm. (a) What distance between the two lenses will allow the telescope to focus on an infinitely distant object and produce an infinitely distant image? (b) What distance between the lenses will allow the telescope to focus on an object that is 5.0 m away and to produce an infinitely distant image?

ANSWER:

Step 1 of 4

(a)

Here we need to calculate the distance between the lenses. If the focal lengths of the lenses are  and .

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