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Young’s Formula
Factors affecting the interference pattern
The relationship between λ, a, x and D
The interference pattern depend on the
Node line
x x Antinode line value of x. When x changes, the
interference pattern also changes .
λ α x
λ D
λ D x= x
a
λ
S 1 a S 2 ****Draw graphs 0
ax 1 D α x
λ = x α
D a
x x
a = distance between two coherent sources
λ = wavelength
x = distance between two consecutive node (or
antinode) lines
D = distance from the two sources to the point of 1
measurement of x
0 a 0 D
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