Please add some explanations wherever their is a use of s gn

Last updated: 6/18/2023

Please add some explanations wherever their is a use of s gn convention in magnification formula and mirror formul a 7 A concave mirror of focal length 18 cm forms an erect image three times the size of the object How far is the object from the mirror 1 36 cm 3 15 cm A naint ahinnt in plannd at dintonon of on 2 18 cm 4 12 cm