The largest refracting telescope in the world is at Yerkes Observatory in Wiscon

Question

The largest refracting telescope in the world is at Yerkes Observatory in Wisconsin. The objective lens is 1.02 m in diameter and has a focal length of 19.4 m . Suppose you want to magnify Jupiter, which is 1.38×105 km in diameter, so that its image subtends an angle of 12? (about the same as the moon) when it is 6.28×108 km from earth.

Question: What focal-length eyepiece do you need?

Item 7 Part A The largest refracting telescope in the world is at Yerkes Observatory in Wisconsin. The objective lens is 1.02 m in diameter and has a focal length of 19.4 m.Suppose you want to magnify Jupiter, which is 1.38x105 km in diameter, so that its image subtends an angle 0 What focal-length eyepiece do you need? (about the same as the moon) when it is 6.28x108 km from earth. 0244 Submit My Answers Give Up Incorrect; Try Again; 4 attempts remaining

Explanation / Answer

Image size = (2*22*120*6.28*108)/(7*3600)

Magnification = Image size/ Object size = F0 / fe

(2*22*120*6.28*108)/(7*3600)*1.38×105 = 19.4 / fe

fe = 0.0203 m

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