In a YDSE, λ=4000 Å, D=2 m and d=1 mm. Three slabs are available: slab 1 has thickness 2 mm and μ=2; slab 2 has thickness 1 mm and μ=3; slab 3 has thickness 4 mm and μ=3/2. Match the stated slab placements with the resulting fringe properties.

List 1

1. (A) Slab 1 (2 mm, μ=2) placed before S₁

2. (B) Slab 2 (1 mm, μ=3) placed before S₂ in addition to A

3. (C) Slab 3 (4 mm, μ=3/2) placed before slab 1 in addition to B

4. .

List 2

1. (P) Central maximum at C

2. (Q) Central maximum above C

3. (R) Fringe width = 0.8 mm

4. (S) Number of fringes crossing centre due to slab placement = 5000