Refracting Telescope: an Astronomical Telescope Has an Objective of Diameter

question 6

Multiple Choice

Refracting telescope: An astronomical telescope has an objective of diameter 20 cm with a focal length of 180 cm. The telescope is used with an eyepiece of focal length 30 mm. What is the angular magnification of this telescope?

• A) 360 x
• B) 60 x
• C) 540 x
• D) 6 x
• E) 180 x

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