Two coherent monochromatic point sources S₁ and S₂ of wavelength 600 nm are placed symmetrically about the centre of a circle and separated by d=1.8 mm, as shown. Interference produces bright and dark spots on the circumference. Choose the correct statements.

Select all that apply

• Option A

  A dark spot will be formed at the point P₂.

• Option B

  The angular separation between two consecutive bright spots decreases as we move from P₁ to P₂ along the first quadrant.

• Option C

  At P₂ the order of the fringe will be maximum.

• Option D

  The total number of fringes produced between P₁ and P₂ in the first quadrant is close to 3000.