An astronomer is using a telescope to observe two distant stars. The stars are m

Question

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 { m nm}. Assume that the resolution is not limited by the atmosphere. Which of the following actions would improve the resolution?

Part A:
Changing the filter to a different wavelength? If so, should she use a shorter or a longer wavelength?

Part 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?

Part 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?

Part D:
Using an eyepiece with a different magnification? If so, should she select an eyepiece with more or less magnification?

Explanation / Answer

a)she would obtain better resolution with a shorter wavelength.

i=1.22/D

b)it will not make a difference.

c)larger diameter leads to better resolution.

d)it will not make a difference,magnification is not a factor in resolution.

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