Which of the Following Best Describes What We Mean by the Focal

question 55

Multiple Choice

Which of the following best describes what we mean by the focal plane of a telescope?

• A)It is the upper surface of the telescope's primary lens or mirror.
• B)It is the place where,if we mounted film or an electronic detector,we could get a clear (not blurry)image of an object viewed through the telescope.
• C)It is the lower surface of the telescope's primary lens or mirror.
• D)It is the surface of the lens on the eyepiece,through which you would look to see objects in the telescope's field of view.

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