Combination of Lenses question from MHT CET 2026 (15 Apr, Shift 1)

Answer: (c)

1. Cutting perpendicular to the principal axis gives two plano-convex halves (one curved face each).
2. Equiconvex: $\frac{1}{F} = (\mu-1)\frac{2}{R}$; each half: $\frac{1}{F'} = (\mu-1)\frac{1}{R} = \frac{1}{2F}$.
3. $F' = 2F$
4. So the answer is (c) $2F$.