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Wave has many behaviours (Interference (Double slit interference (s=λD/d,…

- - - - n= sin i / sin r
        
        n is refractive index
        
        i is incidence ray
        
        r is refracted ray
- - - - s is distance between two consecutive bright/dark fringe
      - D is distance between screen and source
      - d is distance between two slits
  - - - resultant amplitude larger than any individual amplitude
      - Path difference
        
        nλ
      - Phase difference
        
        no difference in phase
  - - - resultant amplitude smaller than any individual amplitude
      - Path difference
        
        (n+1/2)λ
      - Phase differenve
        
        180 deg//π out of phase
- - - - reflected ray reaches 90 degrees
      - sin c= 1 / n
        
        c is critical angle