A refracting telescope has a converging objective of diameter and focal length

PHYSICS · Subjective · Fermi University Physics · Optics & Photonics · Geometrical optics and imaging · Geometrical optics and imaging

Optics and Photonics, Ch Stops, pupils and optical instruments

Problem

A refracting telescope has a converging objective of diameter

D = 100\ \text{mm}

and focal length

f_o = 1000\ \text{mm}

, and a converging eyepiece of focal length

f_e = 20\ \text{mm}

, arranged in the usual way with the objective's rear focal point at the eyepiece's front focal point. Take the objective rim as the aperture stop. Using the thin-lens equation of Chapter 1 under its sign convention (

s_o > 0

for a real object to the left,

s_i > 0

for a real image to the right,

f > 0

for a converging lens), find where the exit pupil forms behind the eyepiece and its diameter.

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