Yes, you can connect the Lenovo L15 monitor to the Lenovo TB-X505F tablet, but there are a few things to keep in mind:

- The Lenovo L15 monitor has two USB-C ports that are suitable for data and image transfer as well as for power supply.
- To connect the tablet to the monitor, you will need a USB-C to USB-C cable, as both devices have USB-C ports. This cable enables the transmission of image and sound as well as the power supply of the monitor through the tablet, if the tablet supports this.

However, it is important to check whether the Lenovo TB-X505F tablet has a USB-C port that also supports image and sound transmission. Not all USB-C ports offer this function, so you should check the specifications of your tablet.