Engineering Physics

Important Formulae

1. Y = Y₁ + Y₂ = a₁ sin ωt + a₂ sin (ωt + ϕ)

    

2. I = R² = a²₁ + a²₂ + 2a₁a₂ cos ø

    

3. I_max = (a₁ + a₂)² = 4a² if a₁ = a₂ = a

    

4. I_min = (a₁ – a₂)² = 0 if a₁ = a₂ = a
5. x_n for n^th bright fringe
6. x_n for n^th dark fringe
7. Fringe width
8. δ = 2μt cosr = nλ for bright interference fringes
9. 2μt cos r = nλ for dark interference fringes
10. for diameter of ...