An equi-convex lens of refractive index μ₂ and focal length f (in air) is kept in medium of refractive index μ₁. Match Column-A with Column-B.

List 1

1. (P) If lens is cut in two equal parts by plane yy′ (μ₁ = 1)

2. (Q) If lens is cut in two equal parts by plane xx′ (μ₁ = 1)

3. (R) If μ₁ = μ₂

4. (S) If μ₁>μ₂

List 2

1. (1) Lens will act as a glass slab

2. (2) Lens will be converging and focal length will change

3. (3) Lens will be converging and focal length will remain same

4. (4) Lens will be diverging and focal length will change