Condition for constructive interference?
Δx = nλ
Condition for destructive interference?
Δx = λ/2 (2n - 1)
Fringe width in YDSE?
β = λD/d
Position of nth bright fringe?
yn = nλD/d
Position of nth dark fringe?
yn = (2n - 1)λD/2d
Intensity at a point in YDSE? And what is φ equal to
I = I2 + I2 +2√(I 1 I2) cosφ, where φ = (2π/λ)Δx
Condition for constructive interference in thin film?
2μt cos r = nλ
Condition for destructive interference in thin film?
2μt cos r = (n + 1/2)λ
Angular position of minima in single slit diffraction?
a sinθ = nλ, or θ = nλ/2 [angle of first min = θ = λ/a, angle of central maxima 2θ = 2λ/a
Angular width of central maximum in single slit.
2θ = 2λ/a
Linear width of central maximum on screen?
Δy = 2λD/a
Limit of resolution of a microscope?
d = 1.22λ / (2μ sinθ)
Speed of wavelength in medium and air
V = fλ - Medium
C = λf
Refractive index wrt speed of light and wavelength
n = c/v
n = λair/λmed
What are narrow pulses?
Very short time but a lot of sine waves in that short time.
What are coherent sources of light
Continuous light of same wavelength
Same frequency
Same phase or constant phase diff
From one source
Different path causes shift in phase difference
Relationship bw I and Amplitude
I = A^2
