Answer:
Pencil's image will be visible.
Step-by-step explanation:
Light is scattered off all the points of the pencil and into all direction of space if light directed towards the mirror is reflected back into our eyes we can see the pencil.
If the top half of the mirror is covered with a piece of dark paper, Light is scattered off the pencil and reflected off the mirror can enter your eyes and you will see the image of the pencil.