Question: Mars subtends an angle of 8.0 10-5 rad at the unaided eye. An astronomical telescope has an eyepiece with a focal length of 0.032m.

Mars subtends an angle of 8.0 × 10-5 rad at the unaided eye. An astronomical telescope has an eyepiece with a focal length of 0.032m. When Mars is viewed using this telescope, it subtends an angle of 2.8 × 10-3 rad. Find the focal length of the telescope’s objective lens.

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