How do you determine the resolving power of your eye?

The resolving power of your eye can be estimated with a simple experiment, as shown in figure

* All black stripes should be of equal width, while the width of intermediate white stripes should increase as you see from left to right.
* Paste the pattern on a wall at the height of your eye and watch the pattern preferable with one eye.
* By moving away or closer to the wall, all the black stripes to the left of this stripe would merge into one another and wouldn’t distinguishable.
* On the other hand the black stripes to the right of this would be more and more clearly visible.
* Note the width ‘d’ of the white stripe which separates the two regions and measure the distance ‘D’ of the wall from your eye.
$\star \text{ Resolution of your eye }=\frac{\mathrm{d}}{\mathrm{D}}$
$\text{ * For normal eye }{1}^{\mathrm{\prime }}\text{ or }\frac{1}{{60}^{\circ }}$