# Eli5: How Plane mirror can show full image of the object when the size of the given mirror is half of the height of that object ?

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[HERE PHOTOS](http://imgur.com/a/cZVtL6i)

In: Physics

Mirrors reflect the photons of light that hit them. They don’t crop/manipulate the image coming in, merely they just send it back. If something very large has light bouncing into a small mirror, the mirror will reflect that light away, into your eyes.

The “size” of an object decreases the farther away it is; you can see this by holding your thumb up to your eye and blocking all your sight versus holding it at arms length and only blocking a tiny bit of your sight.

A mirror reflects light to show you an image of the object. However, since the light has to travel from the object to the mirror to your eyes, it will appear farther away than it actually is, either to you or the mirror. Farther away means that the object appears smaller. So even with a small mirror, you can see the whole object if you are the correct distance from it.

When light hits a mirror it reflects at the same angle it came in on. Think of photons like a que ball that bounces off a rail perfectly.

One implication of this is that if you shine a light from some plane to a mirror parallel to that plane the light will reflect off the mirror on a spot exactly between where you shone the light from and where it returns to the plane.