Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 27 - Optical Instruments - Problems and Conceptual Exercises - Page 972: 82

Answer

Telescope

Work Step by Step

We know that $ d=f_1+f_2$ $\implies d=50.0cm+2.5cm=52.5cm $ We know that the distance between the two lenses is $52.5cm $; from the above calculation, we can see that the sum of the foal lengths of the two lenses is equal to the separation between the lenses; thus, the instrument is a telescope.
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