length, info, img = detector.findDistance(lmList1[8], lmList2[8], img)

As an AI language model, I can explain what this line of code does.

This line of code uses a function named `findDistance()` from a detector object to calculate the distance between two landmarks in two different landmark lists (`lmList1` and `lmList2`). The specific landmarks being compared are the ones at index 8 in both lists.

The `findDistance()` function returns three values - the distance between the two landmarks, info about the landmarks being compared, and an image with the landmarks and the distance displayed on it. These three values are assigned to the variables `length`, `info`, and `img`, respectively.

Overall, this line of code is part of a program that uses computer vision techniques to track and analyze hand movements or gestures.