diffraction

Question 1

state Huygen’s principle

Answer 1

every point on an initial wavefront acts as a source of secondary wavelets such that the wavefront at some later time is the envelope of these wavelets.

Question 2

intensity equations for Young’s double slit

Answer 2

I = I₀ * cos²(kΔL/2)
ΔL: path difference = dsin(θ)

I₀ = 2A²
I₀: intensity of the central maxima (probably)

Question 3

Single slit diffraction intensity equation

Answer 3

I(θ) = I₀ * sin²(β)/β

where:
β = ½kd*sin(θ)
I₀ = ½α²d²

α is some constant

Question 4

whats Fresnel and Fraunhofer diffraction

Answer 4

Fresnel:
near field diffraction (the screen is too close to the diffraction grating)
when drawing the intensity, the peak plateaus.

Fraunhofer:
far-field diffraction. the screen is far enough from the diffraction grating to get regular diffraction.

Question 5

circular slit diffraction equation

Answer 5

the first minimum is at:

sin(θ) = 1.22 * λ/d
d: aperture diameter