Chapter 23 - Mirrors and Lenses - Learning Path Questions and Exercises - Exercises - Page 806: 3

a). $80 cms$ b). $5 cms$ c). $1$

a). The mirror is a plane mirror and not concave or convex the image will be same distance away from the mirror as the object. The distance between object and image = 40+40=80cms b). Magnification is 1, so the image's height is 5 cms. c). Plane mirrors will always have a magnification of 1.