SIGN CONVENTION OF A LENS
We follow new Cartesian sign conventions. (a) The distance always measured from optical centre. (b) The distance measured to the right of the optic centre is taken as positive and to the left is negative. (c) The height measured vertically upward is positive whereas vertically downward is negative.
We follow the ‘new Cartesian sign convention’. The pole of the mirror is taken to be at origin of the rectangular coordinate system. Accordingly, we shall use the following convention regarding the sign of various quantities. (a) All distances are measured from pole of mirror. (b) The distances measured in the same direction as the […]