Chapter 9.3 Flashcards
What is the condition necessary for constructive interference in double slit interference?
dsinθ = nλ, n = 0, ±1, ±2, ±3…
d = distance between the slits
Formula for distance from the center of a screen to a constructive interference point P
s = (nλD)/d
When are two light sources coherent?
If the phase difference between the sources stays constant as time goes on
Formula that gives the angle at which primary maxima can be observed for multiple slits
dsinθ = nλ, n = 0, ±1, ±2, ±3…
d = separation of two successive slits
What is the relationship between the angle that the primary maxima of a multiple-slit pattern is observed at relative to a two-slit patter with the same slit separation?
They are observed at the same angle
In general, what three things will happen if the number of slits are increased to N?
Primary maxima will become thinner and sharper, width proportional to 1/N
The number of secondary maxima is given by N-2, and become unimportant
Intensity of central maximum is proportional to N^2
What is the phase change a ray of light will go through if it reflect off a medium of higher refractive index?
π
Constructive interference for thin film interference when there is only one phase change
2dn = (m + 0.5)λ
d = thickness of the film
n = refractive index
Destructive interference for thin film interference when there is only one phase change
2dn = mλ
d = thickness of the film
n = refractive index
Constructive interference for thin film interference when there are no or two phase changes
2dn = mλ
d = thickness of the film
n = refractive index
Destructive interference for thin film interference when there are no or two phase changes
2dn = (m + 0.5)λ
d = thickness of the film
n = refractive index
