# NTNUJAVA Virtual Physics LaboratoryEnjoy the fun of physics with simulations! Backup site http://enjoy.phy.ntnu.edu.tw/ntnujava/

## Easy Java Simulations (2001- ) => Optics => Topic started by: Fu-Kwun Hwang on December 22, 2009, 10:14:49 pm

 Title: illustrate refraction with dog running Post by: Fu-Kwun Hwang on December 22, 2009, 10:14:49 pm The velocity of wave changes when wave move from one media into another media.For light: The index of refraction is defined as $n=c/v$, where $c$ is the speed of light in vacuum, and $v$ is the speed of light in media.The following animation use many dogs running from one region into another region.Due to the condition on the ground , dogy's speed is different when running from one region into another region.It obeys Snell's Law $n_1 \sin\theta_1 =n_2 \sin\theta_2$.You can use $n_1,n_2$ slider to change speed of running dogs and c1 to change it moving direction.