Chapter-10|Wave Optics|NCERT 12th Physics:
Interference of Light Wave:
Interference of light is the phenomenon of redistribution of light energy in a medium on account of superposition of light waves from two coherent sources.
At the points where the resultant intensity of light is maximum, interference is said to be constructive.
At the points where the resultant intensity of light is minimum, the interference it said to be destructive.
Theory of Interference of Waves:
Let the waves from two coherent sources of light be
y₁= a sinωt and y₂= b sin(ωt+Ø ) – (I)
Where, a and b are the respective amplitudes of the two waves and Ø is the constant phase angle by which second wave leads the first wave.
According to superposition principle