The source figure shows a double-slit fringe pattern for λ=600 nm with points P, Q, R, S and T marked relative to the central bright fringe. Choose the correct statements.

Select all that apply

• Option A

  The third order bright fringe is R.

• Option B

  The third order bright fringe is T.

• Option C

  The fringe resulting from a phase difference of 4π is S.

• Option D

  If ΔXA and ΔXC represent path differences between waves interfering at P and R respectively then (|ΔXC| - |ΔXA |) is equal to 300nm.