What is the difference between the images formed by a large and a small mirror?

Q. Two mirrors are placed parallel and facing to each other. The size of the mirrors is different. A small object is kept in between the mirrors. How many images are formed?

Q. An object O is placed in front of a small plane mirror $M_1$ and a large convex mirror $M_2$ of local length $f$. The distance between O and $M_1$ is $x$, and the distance between $M_1$ and $y$. The image of O formed by $M_1$ and $M_2$ coincide. The value of $f$ is:

Q. Which of the following images is real?

(a) image formed by a plane mirror
(b) image formed by a convex mirror
(c) image formed by a concave mirror with object between the mirror and focus
(d) image formed by a convace mirror with object behind the focus

Q. (a) Define a spherical mirror.
(b) Distinguish between a concave mirror and a convex mirror.
(c) What is the difference between a real image and a virtual image?