When light propagates through different medium, its wave speed changed,
When light is traveling from water to air, it will bent away from the norm of the surface.
If the incident angle is greater than 48 degree,
The refraction of light is responsible for many illusion:
A submerged object appears to be nearer the surface than it actually is.
This java applet let you feel it :
Usage: The whole area is divided into two region:
The blue polygon is the image of the block.
Click one of the corner of the cyan block with left mouse button
Fill a cup of glass with water and look at objects behind the glass. Try it!
Your suggestions are highly appreciated! Please click firstname.lastname@example.org
Author¡GFu-Kwun Hwang, Dept. of physics, National Taiwan Normal UniversityLast modified : More physics related java applets