Name: Reflected Cats - Numberphile
Uploaded: 2020-03-27T17:30:53.000Z
Duration: 3 min 30 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

Tadashi: So here's a mirror of sorts, it's curved.

And in front of this mirror, I put this rectangular sheet (with something drawn on it).

And when you put it in front of the mirror

and side protrusions that look like whiskers and everything.

But for those of us who'd like to say so: here's the thing.

but that's what we call a "convex mirror."

how many reflections are bouncing off before it reaches our eyes.

It's reflecting on the back side and then coming out.

looks very much like the cat on the outside.

Although the cat on the outside is from a convex mirror

whereas the cat on the inside is from a concave mirror.

and you might expect the distortion effects to be the opposite

but one thing that has to do with this effect is the following.

But let's look at it on the inside on the concave mirror.

where the center of focus you are placing the arrow.

As I move the arrow inside, or according to the outside, move the mirror

you come to the point where you see the real image next to the original arrow.

you know I thought something like this might be interesting to try.

you know, slightly bulging out or bulging in

and so in a way, you can find that in cosmetic shops

I went to the shopping center and I found one!

It's a cookie cutter, you know, where you

make the cookie dough and then cut the shapes.

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Reflected Cats - Numberphile

sort

eventually

slightly

matter