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The Human Eye and Colourful World
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04/12/2020 12:40 pm
Topic starter
A telescope has an objective of focal length 140.0 cm and an eyepiece of focal length 5.0 cm. Find
(i) the magnification of the telescope for viewing distant objects for normal adjustment
(ii) separation between the objective lens and the eyepiece.
1 Answer
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04/12/2020 12:43 pm
Objective of focal length, f0 = 140.0 cm.
Eyepiece if focal length, fe = 5.0 cm
(i) The magnification of the telescope, m = f0/fe
= 140/5
= 28
(ii) Separation between the objective lens and the eyepiece,
L = f0 + fe
= 140 + 5
= 145 cm = 1.45 m