Question

give the position and magnitude of the reflatnex when magnification in 1​

Answer 1

$\huge\mathbb\fcolorbox{purple}{lavenderblush}{✰Answer}$

A magnification of 1 (plus or minus) means that the image is the same size as the object. If m has a magnitude greater than 1 the image is larger than the object, and an m with a magnitude less than 1 means the image is smaller than the object.