Interference of Light — Formula Sheet
ICSE · Class 12 · Physics
12 formulas from Interference of Light (ICSE Class 12 Physics) on one page, grouped by topic. Part of the ICSE Class 12 Physics syllabus.
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Formulas and Key Relations
1) Core Ideas and Definitions
φ = (2π/λ)x
I = I1 + I2 + 2√(I1I2) cosφ
2) Young’s Double-Slit Experiment
S2A = xd/D
x_m = mDλ/d
x_m = (m - 1/2)Dλ/d
β = Dλ/d
θ = λ/d
3) Intensity Relations and Visibility
Imax = I1 + I2 + 2√(I1I2) = (√I1 + √I2)^2 = K(a1 + a2)^2
Imin = I1 + I2 − 2√(I1I2) = (√I1 − √I2)^2 = K(a1 − a2)^2
I = 4I0 cos^2(φ/2)
Fringe visibility ratio = 2√n/(n+1)
4) White Light and Special Cases
Visible white-light range: 4000 Å to 7500 Å
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