There are a few ways to get Google Lens.
The first way is to install the Google Lens app on your Android device. Once you have the app installed, you can launch it and point your camera at something to get information about it.
Another way to get Google Lens is to use the Google app. Just open the app and tap on the Lens icon in the search bar. This will launch the Lens feature and you can point your camera at something to get information about it.
You can also get Google Lens by long-pressing on an image in Google Photos. This will launch the Lens feature and you can get information about the image.
Lastly, you can get Google Lens by long-pressing on the home button of some Android devices. This will launch the Google Assistant and you can tap on the Lens icon to launch the Lens feature.