Note that Google Lens works only when you login with Google account and your device must be connected to a network.
Method 1: touch the “Camera” app -> touch the Google Lens icon

Method 2: press and hold the home button or press Google Assistant Button to enter Google assistant -> touch the Google Lens icon at the bottom of the screen.
Method 3: touch the “Photos” app -> select a photo -> touch the Google Lens icon

On Android 11, Google Lens has seven features:
1) Translate: Point at text, then tap capture to translate.
2) Text: Take a photo of words to copy.
3) Search: Tap shutter button to search.
4) Homework: Point at homework, then tap capture for help.
5) Shopping: Take a photo of products or barcodes.
6) Places: Point at buildings for details.
7) Dining: Take a photo of food or a menu.