A Keplerian Refracting Telescope Is Used to Look at Craters

question 61

Multiple Choice

A Keplerian refracting telescope is used to look at craters on the moon.The objective focal length of the telescope is 92 cm and the distance between the objective and eyepiece lenses is 97 cm.The diameter of the objective is 25 cm.What is the focal length of the eyepiece?

• A)5.0 cm
• B)2.5 cm
• C)15 cm
• D)10 cm
• E)20 cm

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