How Far Apart Should the Objective Lens and the Eyepiece

question 356

Multiple Choice

How far apart should the objective lens and the eyepiece lens be in a refracting telescope? (See Figure 3-19,Comins,Discovering the Essential Universe,6th ed.)

• A) a distance equal to the focal length of the objective lens
• B) a distance equal to the focal length of the eyepiece lens
• C) a distance equal to the focal length of the objective lens minus the focal length of the eyepiece lens
• D) a distance equal to the sum of the focal lengths of the two lenses

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