273 dots/inch

Explanation:

We are given:

•Average wavelength = 555mm

•d = 3.5mm

• distance = 48cm

Let's use the Reyleigh formula:

∅ = 1.22

Substituting figures in the formula, we have:

From the formula above, we get:

∅ = x/d

where x is distance btw dots and pupil

Solving for x we get:

x =∅d

To calculate dots per inch(dpi), we use:

We already know 1 inch =2.54cm

Therefore,

273 dots/inch

y <8 10⁻⁶ m

Explanation:

For this exercise, they indicate that we use the Raleigh criterion that establishes that two luminous objects are separated when the maximum diffraction of one of them coincides with the first minimum of the other.

Therefore the diffraction equation for slits with m = 1 remains

a sin θ = λ

in general these experiments occur for oblique angles so

sin θ = θ

θ = λ / a

in the case of circular openings we must use polar coordinates to solve the problem, the solution includes a numerical constant

θ = 1.22 λ / a

The angles in these measurements are taken in radians, therefore

θ = s / R

as the angle is small the arc approaches the distance s = y

y / R = 1.22 λ / s

y = 1.22 λ R / a

let's calculate

y = 1.22 500 10⁻⁹ 0.42 / 0.032

y = 8 10⁻⁶ m

with this separation the points are resolved according to the Raleigh criterion, so that it is not resolved (separated)

y <8 10⁻⁶ m

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