What focal length can be assigned to a plane mirror?

What is the focal length and the power of a plane mirror?

What is the magnification produced in a plane mirror ?

At what distance from a concave mirror of focal length f an object is to be placed so that a real image of n times magnified will be formed?

Three times magnified image of an object is formed on a screen placed at a distance of 8 cm from the object with the help of the spherical mirror. Determine the nature of the mirror. Focal length and the distance the mirror from the object.

The focal length of a concave mirror in vacum is 2 m. What will be the focal length of the concave mirror in a medium of refractive index 2.76?

A short linear object of length L lies on the axis of a spherical mirror of focal length f at a distance K from the mirror. Calculate the axial length of the image.

What is the minimum size of a plane mirror which can enable a man to see his full image?