Magnification of a mirror is -1. What type of mirror is it? What is the position of object and image? Give the nature of the image.

This can be deduced from the formula,

While considering image formation, h_{1} is always positive. So, this gives us h_{2} as negative. Hence, the image is real and inverted.

Now, the mirror which forms a real image is a concave mirror. So, the mirror is concave, the object is placed on the left-hand side of the mirror and so is the image obtained.

Therefore, we can conclude that the image is real, inverted and of the same size as the object as the magnitude of magnification is 1.