Plane mirrors and images formed by them

Q.

In a completely dark room, if you hold up a mirror in front of you, will you see a reflection of yourself in the mirror?

Q. In a completely dark room, we can see our face in the mirror.

1. True
2. False

Q. Periscope is made using ______ mirror.

1. plane
2. concave
3. diverging
4. convex

Q. Which of the following is an opaque object?

1. Air
2. Glass
3. Pure water
4. Mirror