In diffuse reflection the light is scattered in all directions. The image formed by a plane mirror lies behind the mirror. It is a virtual image because no light actually converges at the image point. For a real object, the image in a plane mirror lies as the same distance behind the mirror as the distance from the object to the front of the mirror. You should be able to explain why things appear reversed left to right in a plane mirror and why things are not reversed in a right angle mirror.
Refraction is the bending of a light ray as it passes from one medium to another.
A light ray passing from an optically less dense medium to a more dense medium is bent toward the normal. Similarly, a light ray passing from a more dense medium into a less dense medium is bent away from the normal. What's more, you should be able to use it. When the light is incident on an interface from within the more dense medium, the emerging light rays are bent away from the normal. As the angle of incidence is increased, the angle of transmission is increased until it reaches 90 .