Reflections can be placed on surfaces such as a mirror, window, inanimate objects, and eyes. For this example, we will discuss how to place a reflection on a mirror surface.
Step 1: Select the mirror in the “Scene” pane.
Step 2: Mirror(s) may have multiple surfaces (back, side, front, etc.). Within the “Surface” pane, select the “Editor” tab and then select the surface that you wish to add a reflection to.
Step 3: Increase the value to 1.00 within the “Glossy Reflectivity” slider. Then decrease the value of the “Glossy Roughness” slider.
Reflections are not seen immediately within the “Viewport”, in addition, some other surface properties (bump, displacement) will not come into existence until you render the scene.
Just as in the real world, reflection requires a light source; therefore, if you have NO light within the scene, you will have no reflection. Just as in the real world again, in order to have a specific image appear within the mirror, the image must be angled in order to reflect correctly.