Hi Kerolos,

m, does refer to magnification but there are 2 aspects of it that you should recognize. The absolute value of m (whether it is greater than |1| or less than |1|) tells you about SIZE of the image. Such that if the absolute value is greater than 1, the image is enlarged. If the absolute value of m is less than 1, the image is diminished. The SIGN of m tells you the image orientation. Positive m means the image is upright and negative m means it is inverted.

I think you may have been merging knowledge of the +/- with the magnitude and I hope this clarifies. As a suggestion, I think it would be helpful if you read through this link:

https://www.physicsclass...cs-for-Concave-Mirrors. It classifies the concave mirror situation into 5 situations based on where the object is placed and I think it will help visualize everything on a single page.

Please let me know if you have additional questions!