An astronomer is using a telescope to observe two distant stars. The stars are marginally resolved when she looks at them through a filter that passes green light near 550 nm. Which of the following actions would improve the resolution? Assume that the resolution is not limited by the atmosphere. Select all that apply. using a telescope with an objective lens of the same focal length but a smaller diameter using a telescope with an objective lens of the same diameter but longer focal length using an eyepiece with more magnification using a telescope with an objective lens of the same diameter but shorter focal length using an eyepiece with less magnification using a telescope with an objective lens of the same focal length but a larger diameter changing the filter to a longer wavelength changing the filter to a shorter wavelength.