Which statement about prism is TRUE?

The statement that "1D of △ produces a displacement of 1cm at the distance of 1M" is true because it accurately represents the relationship between the angle of a prism and the resultant displacement of light passing through it. In the context of prisms, "1D" refers to 1 degree of angular deviation. When light passes through a prism, it is refracted, which leads to a measurable displacement of the light beam.

This displacement is typically determined by the prism's geometry and the angle of incidence. For a standard prism with certain characteristics, a deviation of 1 degree will correspond to a 1 cm displacement observed at a distance of 1 meter from the prism. This is based on established optical principles, where the deviation angle and the resulting lateral shift of light are directly proportional under certain conditions.

The other statements do not align with this principle, such as disproportional displacement values or suggestions that no displacement occurs, which would be inconsistent with the fundamental behavior of prisms when interacting with light.