Refraction causes images to appear in unexpected positions, ie bottom of a swimming pool and "the disappearing coin" trick Lens Lenses form images of objects by refracting light.
(Refraction; causes; images to appear in unexpected positions) Context(Refraction causes,List([0, 17))):(images; to appear; L:in unexpected positions)
Refraction causes,List([0, 17))
Refraction images
causes to appear
images to appear in unexpected positions
L:in unexpected positions