[ One day Ema will learn that Lys is an actual medieval person. Until then, Lys's questions will just seem very strangely remedial, but we still love and cherish her. ]

Eh. Something like that.

[ Cue sweating as the topic comes dangerously close to Ema admitting that she failed the forensics test and has zero access to a professional crime lab but HEY here's this magnifying glass she's whipping out of her lab coat! Wow! They can talk about this instead! ]

It's like this! But much more powerful, of course. A microscope takes two of more of these specialized lenses and makes them work together to get an even stronger zoom. Telescopes work on a similar principle.

[ Lys is free to take the magnifying glass to play with, if she wants... ]