At What Distance from the Objective Lens in a Refracting

question 212

Multiple Choice

At what distance from the objective lens in a refracting telescope is the primary image formed-that is, at what distance would a person place photographic film if one wanted to take a photograph?

• A) its focal length
• B) its diameter
• C) twice its focal length
• D) immediately behind the lens to collect the most light

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