Why do you appear upside down in a spoon?

MaryAnnDVC

"Mare", DISing since '99; prefers being tagless
Joined
Feb 9, 2001
Messages
14,950
The "stump mom" question of the day. :rolleyes: I think I knew this at one point but forgot. I told them I was busy and would tell them later. ;) So...why??
 
Small concave spherical and parabolic mirrors, like the front of a spoon,
produce images that are inverted to look upside down but not reversed left-
to-right. Convex mirrors produce images that are reversed left-to-right
but not inverted to look upside down yet, convex mirror images are
distorted in such a way as to make it easier to see a wide field of view,
but objects look smaller toward the center of the mirror. Convex mirrors
are often mounted near the intersections of hallways and on the sides of
automobiles because they allow you to see a wide area and "around the
corner" (Objects in mirror are closer than they appear!). You can picture
this in your mind by thinking about how the light will be reflected. For
example, if you are facing a concave mirror, then a beam of light coming
straight out of your forehead would strike the mirror and be reflected
down toward your feet. Likewise a beam of light from your feet is
reflected toward your head, thus it looks like you are standing upside
down. Try putting some handwriting and a few arrows pointing up, down,
left and right on a piece of paper, then looking at the reflection from a
flat mirror (like in the bathroom) and then the reflection from the front
and back of a spoon. Good Luck!

(NOTE: I found this answer in a search.) :)
 
Gee, thanks, MIchelle! I think my DH's answer was easier..."Magic!". LOL
 
I've always wondered if the spoon actually shows things as they normally appear. Don't the cones in our eyes (or something like that;)) reflect light and show things opposite as they really are?
 

That's why these heads seem to move and follow you as you ride through the room. They're not busts, but actually concave. :)

http://www.***********.com/156415d00.jpg
 
it depends upon how the image is reflected by the spoon. It's basically light and optics. We learned it in Physics. It's the same principle that there are magnifying mirrors for makeup. If you move closer to a convex (ie spoon), your image is upright. you move back and, after you pass the spoon's focal point, the image gets flipped.
 

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