reflective of black shadows on a white flat

Try this:

1. Create a white flat surface and place your object on it.
2. Add two lights on either side of the object to create the shadows. Adjust the intensity, angle, and distance of the lights to get the desired effect.
3. Add a reflection plane to the scene and align it with the white flat surface. This will make the surface reflective and show the shadows of the object.
4. Adjust the opacity, roughness, and metalness of the reflection plane to control how much reflection and shadow you want to see.