Northwestern Physics Demos                                 Go back to LIGHT  
DCS# 6A20.30NWU#  Location:  4 D 4
title: Lamp in Socket
aka:  Ghost bulb illusion

Description:
A light bulb in a socket is placed below an empty socket at the 2f location in front of a parabolic mirror.  The image appears in the empty socket.

Question?
   What is the location of the object (light bulb) so that its image is located just above it?
pix of set uppix of bulb image