Question

Two similar plano - convex lenses are combined together in three different ways as shown in the adjoining figure. The ratio of the focal lengths in three cases will be

• A. 2 : 2 : 1
• B. 1 : 1 : 1
• C. 1 : 2 : 3
• D. 2 : 1 : 1

Answer 1

The correct option is B 1 : 1 : 1

Hence, option $\left(B\right)$ is correct answer.