Imagine a handheld device with an advanced laser imaging system. Multiple lasers will be shot form the device to a reflective object. The object will reflect the laser to an enemy which would not be see-able regularly because of no direct vision angle.
I presume that most surfaces are reflective in some way or another or we would not see them, the trick is to have a strong or "smart" enough laser to visualize the second reflected object.
Also, some of the light waves of the laser are reflected and some are diverted, it's a matter of reading the ones that got diverted and than reflected back.
Not sure this is optically possible...