How Does the Mirror Know?

Text on the meme

Can anyone explain how does the mirror know that there’s an object there? Can someone please tell me how this works? Im genuinely confused Thank you How!?

What it means

A person demonstrates several confusing mirror illusions in a bathroom and bedroom, placing objects and paper against or behind a mirror. The joke is exaggerated bafflement about how a mirror can show hidden objects, turning ordinary reflections and optical tricks into a ridiculous mystery.

Objects

hand / рука white egg-shaped object / белый предмет в форме яйца bathroom mirror / зеркало в ванной paper sheet / лист бумаги cup / стакан bottle / бутылка shampoo or lotion bottle / бутылка с шампунем или лосьоном bedroom / спальня television / телевизор pink blanket / розовое одеяло scissors / ножницы thank-you card / благодарственная открытка faucet / кран soap dispenser / дозатор мыла woman's face / лицо женщины green round object / зелёный круглый предмет bathroom / ванная комната