Situation 19.3 the Angular Magnification of a Refracting Telescope Is 40.When the 40.When

question 29

Multiple Choice

Situation 19.3
The angular magnification of a refracting telescope is 40.When the object and final image are both at infinity,the distance between the eyepiece and the objective is 143.5 cm.The telescope is used to view a distant radio tower.The real image of the tower,formed by the objective,is 6.0 mm in height.The focal point of the eyepiece is positioned at the real image.
-In Situation 19.3,the focal length of the objective,in cm,is closest to:

• A)137
• B)138
• C)139
• D)140
• E)141

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