The final image formed in a periscope is:

The correct option is C reflected
A simple periscope is just a long tube with a mirror at each end. The mirrors are fitted into each end of the tube at an angle of exactly 45 degrees so that they face each other.
In the periscope, light hits the top mirror at 45 degrees and reflects away at the same angle. The light then bounces down to the bottom mirror. When that reflected light hits the second mirror it is reflected again at 45 degrees, right into our eye.
Light is always reflected away from a mirror at the same angle that it hits the mirror.
Hence, the image formed in a periscope is reflected, and not real.