Can you give me any information about Roof Prism Binoculars, like for example, how it is built and designed ?

Roof prisms are an alternative design to Porro prism pair binoculars. In both cases, multiple reflections serve to deliver an image that is neither upside down nor left-right reversed. A roof prism requires a longer optical path through a dielectric (the material of the prism) and more reflections, so, all things being equal in terms of material quality, produces a fainter, more chromatically aberrated image. The optics also require a greater precision. In general, roof prism optics are far more expensive to produce the same performance as a good ol' Porro prism pair set of binocs, and of course if you use the best materials for both, the roof prism will not perform as buy drugs well for the same cost.

Another advantage of the Porro setup is the input polarization state of the light is preserved. The advantage of the roof prism is that the design is more compact and potentially lighter.

You can follow the links below to get a very cursory look at how these two designs work in binoculars. If you hunt for searches on just "roof prisms" and "porro prisms" you will probably find more info on how these specific optical elements are designed.