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how to use camera of the smartphone on a tablet

Hi all,
excuse me if the title is not clear, trying explaining better:

the PC of my son has died and he's using now, as urgency, his tablet to follow school's lessons remotely.

for some days he will has to go this way but the camera of the tablet is very bad so I thought to use camera of his smartphone.

My idea is:

1. he launch the app ("zoom" or similar) on the tablet
2. he follows the teacher on the screen of the tablet (since it is larger than smartphone)
3. the teacher watches him from the camera of the smartphone

is there a way to connect the devices and let the tablet use the camera of the smartphone?

thanks for help!

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