Question

An equi-convex lens has power P. It is cut into two symmetrical halves by a plane containing the principal axis and then two pieces are joined as shown in Fig. The power of the combination will be –

• A. P
• B. 2P
• C. P/2
• D. Zero

Answer 1

Answer: (B)

2P

Answer 2

P_eff = P₁ + P₂ = P + P = 2P