A magnifying lens has a focal length of $100 \mathrm{mm}$. An object whose size is $16 \mathrm{mm}$ is placed at some distance from the lens so that an image is formed at a distance of $25 \mathrm{cm}$ in front of the lens.

What is the distance between the object and the lens?

A magnifying lens has a focal length of $100 \mathrm{mm}$. An object whose size is $16 \mathrm{mm}$ is placed at some distance from the lens so that an image is formed at a distance of $25 \mathrm{cm}$ in front of the lens.

Where should the object be placed if the image is to form at infinity?

Copy and complete the diagram below to show what happens to the rays of light when they pass through the concave lens:

Which type of lenses are:

Thinner in the middle than at the edges?

Which type of lens is thicker in the middle than at the edges?

(Choose from Convex lens/ Concave lens)