The following knowledge about shadow and physics is incorrect: () A. Hand shadow-linear propagation of light B. Photography-reflection of light C. Film-convex lens

A hand shadow is formed when light propagates in a straight line and is blocked by hands. This option is correct;

B, photography is formed due to the refraction of light, using the imaging principle of convex lens, not the reflection of light, this option is incorrect;

C, film is made of convex lens, is the refraction of light, this option is correct;

D, reflection is formed by the reflection of light, that is, plane mirror imaging, this option is correct;

So choose B.