Write the sign conventions used for measuring distances in case of sph

1.	Write the sign conventions used for measuring distances in case of spherical surfaces.
Answer» (a) All the distances are measured from the pole or optical center of the lens. (b) The distances measured along the direction of incident light are taken as positive and negative in a direction opposite to it. (c) The heights measured upwards with respect to X-axis are positive and negative downwards.

Write the sign conventions used for measuring distances in case of spherical surfaces.

Answer»

(a) All the distances are measured from the pole or optical center of the lens.

(b) The distances measured along the direction of incident light are taken as positive and negative in a direction opposite to it.