Figure 25-48 was taken from the NIST Laboratory (National Institute of Standards and Technology) in Boulder, CO,

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Figure 25-48 was taken from the NIST Laboratory (National Institute of Standards and Technology) in Boulder, CO, 2.0 km from the hiker in the photo. The Sun's image was 15 mm across on the film. Estimate the focal length of the camera lens (actually a telescope). The Sun has diameter 1.4 × 106 km, and it is 1.5 × 108 km away.
Figure 25-48 was taken from the NIST Laboratory (National Institute
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