An astronomer is trying to observe two distant stars. The

Chapter 35, Problem 35.29

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An astronomer is trying to observe two distant stars. The stars are marginally resolved when she looks at them through a filter that passes green light with a wavelength near 550 nm. Which of the following actions would improve the resolution? Assume that the resolution is not limited by the atmosphere. A. Changing the filter to a different wavelength. If so, should she use a shorter or a longer wavelength? B. Using a telescope with an objective lens of the same diameter but a different focal length. If so, should she select a shorter or a longer focal length? C. Using a telescope with an objective lens of the same focal length but a different diameter. If so, should she select a larger or a smaller diameter? D. Using an eyepiece with a different magnification. If so, should she select an eyepiece with more or less magnification?

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