Question

Magnification produced by a plane mirror is +1. It means:
A. Image formed by a plane mirror is greater than the size of the object
B. Image formed by the plane mirror is erect and of same size as of the object
C. Image formed by the plane mirror is smaller than the size of the object and is virtual
D. None

Answer 1

Hint: We must have a clear idea of what type of images are formed by convex, concave and plane mirrors and also about the nature of the images formed. If we know this for the plane mirror, we answer the question easily.

Complete step by step answer:
The plane mirror is a mirror with a flat or planar reflective surface. The image formed by the plane is always virtual and lateral inversion occurs when the image is formed by the plane mirror. Lateral inversion is experienced by us in our daily lives, if we hold up our right hand in front of the plane mirror the image formed will put up his left hand, this is called lateral inversion.
The magnification produced by a mirror is given by the formula,
$m=-\dfrac{\text{Distance of Image}}{\text{Distance of Object}}=-\dfrac{v}{u}$
The distance of object and distance of image are equal in the case of a plane mirror and the object distance is negative. Which gives us a magnification of +1. M=1 signifies that the height of image and height of object are the same and the positive sign signifies that the image formed is erect.
So the answer to the question is option (B)- Image formed by the plane mirror is erect and of the same size as the object.

Note:
Focal length of the plane mirror is taken as infinity.
Radius of curvature is also taken as infinity.