V.K. Sally Solutions for Chapter: Light - Reflection and Refraction, Exercise 15: Practice Problems : 6

Calculate the power and focal length of a combination of convex lens of focal length $25 \mathrm{cm}$ and concave lens of focal length $10 \mathrm{cm}$.

A convex lens of focal length $40 \mathrm{cm}$ is placed in contact with concave lens of focal length $25 \mathrm{cm}$. Calculate the power of the combination.

A convex lens of focal length $40 \mathrm{cm}$ is placed in contact with concave lens of focal length $25 \mathrm{cm}$. Calculate the focal length of the combination.