The camera is set in a proper direction by _________
Viewfinder:
4.1. Pentaprisms: It is used to redirect the light from the lens to the viewfinder. They are generally found in professional-grade DSLRs (Digital Single Lens Reflex).
4.2. Pentamirrors: These are constructed of plastic instead of glass. They are generally found in entry-level DSLRs (Digital Single Lens Reflex).
Hence, the camera is set in a proper direction by the viewfinder.