Hand Shadow Photography Water Reflection

A. The shadow of a hand is a shadow. When light encounters an opaque object while propagating along a straight line, the dark area formed behind the object that cannot be illuminated is called a shadow, so A is correct;

B. Photography uses the principle of using convex lenses to create inverted, reduced, and real images. It is a refraction phenomenon of light, so B is wrong;

C. Projection uses the principle of using convex lenses to create inverted, magnified, and real images. , it belongs to the refraction phenomenon of light, so C is wrong;

D. The reflection of the scenery on the shore in the water is the image of a plane mirror. The calm water surface is equivalent to a plane mirror. Its principle is the reflection of light, so D is wrong.

Therefore choose A.