Question
Find the magnification of a telescope that uses a 2.75 -diopter objective lens and a 35.0 -diopter eyepiece.
Step 1
The power of a lens is the reciprocal of its focal length. Therefore, the focal length of the objective $f_o$ is $1/P_o$ and the focal length of the eyepiece $f_e$ is $1/P_e$. Show more…
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A telescope is 275 $\mathrm{mm}$ long and has an objective lens with a focal length of 257 $\mathrm{mm}$ . (a) What is the focal length of the eye-piece? (b) What is the magnification of this telescope?
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