Problem: The planet Neptune is 4.5 × 1012 m from the earth. Its diameter is 4.9 × 10 7 m. What diameter telescope objective would be necessary to just barely see Neptune as a disk rather than as a point of light? Assume a wavelength of 550 nm.

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The planet Neptune is 4.5 × 1012 m from the earth. Its diameter is 4.9 × 10 7 m. What diameter telescope objective would be necessary to just barely see Neptune as a disk rather than as a point of light? Assume a wavelength of 550 nm.

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