Access the Active Integrated Media Module “Telescope Magnification” in Chapter 3 of the Discovering the Universe Web site. A common telescope found in department stores is a 3-in (76-mm) diameter...

Access the Active Integrated Media Module “Telescope Magnification” in Chapter 3 of the Discovering the Universe Web site. A common telescope found in department stores is a 3-in (76-mm) diameter refractor with an f_obj
= 750 mm that boasts a magnification of 300 times. Use the magnification calculator to determine the magnifications that are achieved by using each of the following commonly found eyepieces on that telescope: Eyepiece A with focal length 40 mm; Eyepiece B with focal length 25 mm; Eyepiece C with focal length 12 mm; and Eyepiece D with focal length 2.5 mm. Which eyepiece was used in the advertisement and why was that one chosen?