When a plane wave reflects off a plane surface, what is the relationship between the angle of incidence and the angle of
**Wavefront types** point source spherical, distant point source plane, after convex lens plane wave focuses to point because lens adds phase delay proportional to thickness, converging spherical wavefront, after concave mirror plane wave becomes spherical converging to focus, illustrating Huygens construction. The law of reflection states that the angle of incidence equals the angle of reflection. Using Δ = d sinθ, y = n λ D/d, a sinθ = n λ, I = I₀ cos²θ, n = c/v, sinC = 1/n, λ' = λ/n and A = 2a cos(φ/2), calculation gives Angle of incidence = Angle of reflection, illustrating interference, d
Ref: NCERT > Physics Book > Wave Optics > Wavefront and Huygens Principle