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24.5 The Resolution of Optical Instruments 10. A diffraction-limited lens can focus light to a 10-4m-diameter spot on a screen. Do the following I. actions make the spot diameter larger, smaller, or leave it unchanged? a. Decreasing the wavelength of the light: reel \ex- - b. Decreasing the lens diameter: c, Decreasing the lens focal length: lorabet (our of Focus) d. Decreasing the lens-to-screen distance: I nraer (out oF Focus) 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 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? Sne would obtain better Cesaiudion with ashore wovelenciy. @,- haar 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 Jength? ut willnot make adifference: c. Using a telescope with an objective lens of the same focal length but a different diameter? If so, ould she select a dar ger ora smaller diameter? Low exc diameter leacis to bether feseluhion d. Using an eyepiece with a different magnification? If so, should she select an eyepiece with more or less magnification? Tt Will nat make adifFerence, Mos Wi FiCOTION isnot a Sacto tn Cesoludion: 
