Refraction and total internal reflection. In this photograph a red laser beam is incident on a rectangular acrylic block from the left. First the beam refracts (bends) toward the normal to the surface. The angles of incidence and refraction are related through the Snell's law. Then the beam is totally internally reflected at the acrylic-air interface. Total internal reflection occurs when light is incident on an interface between a more optically dense medium and a less optically dense medium and the angle of incidence exceeds a certain value, called critical angle. As the beam exits the block to the right, it refracts again. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Turtle Rock Scientific |
Taille de l’image : | 5039 px × 3290 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |