Explain in breif the sign conventions for lens n mirrors
.......................plz m very confused
Sigh Convention for Lenses
I. Object is always placed to the left of the lens i.e., the light must fall on the lens from left to right.
II. All distances parallel to the principal axis are measured from the optical centre of the lens.
III. Distances along the direction of incident rays (along positive x-axis) are taken as positive, while distances opposite to the direction of incident rays (along negative x-axis) are taken as negative.
IV. Distances measured above the principal axis (along positive y-axis) are taken as positive.
V. Distances measured below the principal axis (along negative y-axis) are taken as negative.
These sign conventions are represented in the following diagram: