mirror at distance

I saw a test of science in junior high school students.
The problem with light and reflection was a difficult choice.
Skirt on the mirror in the upper body position
There is no bottom below the hem.

Can you see this approaching or moving away from the mirror if you go away?

With such a problem

You can see what you see if you go away. The choice is not good.

If it is feeling of daily life and it goes back to the back
It is the impression that it is reflected in a mirror. However, it is because the mirrors of everyday life have been adjusted to just the right height.


In the science problem
Below the hem not reflected in the mirror at a certain distance
Whether you go away or approach
The answer is that it does not show up.


There is no distance between the boundaries of reflection and reflection
Noticing,
There is a gap from the sense of daily life.

These phenomena can be experimented,
It is nice to talk about.

I thought that science question is good that will notice the gap daily sense and science knowledge.