How do you determine the resolving power of your eye?

We may perform a simple experiment to determine the resolving power of eye. We will make a pattern of black stripes of equal width separated by white stripes as shown in the figure below. All the black stripes should be of equal width, while the width of white stripes should increase from left to right. We have to paste the pattern at the height of our eye. By moving away or closer to the wall, we will find the position where we can see some two black stripes as separate stripes. ALL the black stripes which are left to it would merge into one another and on the right they would be more clearly visible. Note the width of the white stripe d that separates the two regions and measure the distance D of the eye from the wall. Then d D is the resolving power of our eye.

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 10 - Wave Optics>Exercise>Q 5

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Resolving power of a telescope will be more, if the diameter $(a)$ of the objective is

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Important Questions on Wave Optics

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 10 - Wave Optics>Exercise>Q 6

Two stars are 10 light years away from the earth. They are seen through a telescope of objective diameter 30 cm. The wavelength of light is 600nm. To see the stars just resolved by the telescope, the minimum distance between them should be