What is the focal length of a plane mirror?

Which of the following is a part of a spherical mirror?

Which of the following statements is true regarding a real image of an object?

$A$ child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size, and that of the legs smaller. What is the order of combinations for the magic mirror from the top?

What is meant by the radius of curvature of a spherical mirror? How is it related to the focal length of the mirror?

Which of the following conditions must be satisfied to obtain a magnified image of an object using a concave mirror?