The author's purpose in including this supporting text is to provide an example of the type of technology discussed in the chapter. The caption highlights spyglasses as an early instrument that relates to the broader topic of advancements in astronomy and technology.
Read the picture caption from Chapter Two of Windows to the Universe: Revolutions in Astronomy.
Caption: Spyglasses like this were early examples of instruments that could magnify images from far away.
What is the author's purpose in including this supporting text?
to explain the technical mechanics of how spyglasses magnify distant objects
to draw a comparison between spyglasses and modern telescopes
to provide an example of the type of technology discussed in the chapter
to emphasize the historical importance of spyglasses in navigation and exploration
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