Make a list of optical devices you know.

Explanation

### Step-by-Step Solution:

1. **Identify Optical Devices**: Begin by listing various optical devices that are commonly known and used in everyday life.

2. **Magnifying Lens**: The first optical device is a magnifying lens, often referred to as a magnifying glass. It is a convex lens that helps in magnifying objects, allowing us to see them larger and more clearly.

3. **Telescope**: The second device is a telescope. This instrument is used to observe distant objects, such as stars and planets. It gathers light and focuses it to create a clear image of faraway celestial bodies.

...