New Cartesian Sign Conventions for refraction of light

For measuring the various distances in a ray diagram of refraction by spherical lenses following sign conventions are used:

1. All the distances in a ray diagram of refraction by spherical lenses are measured from the optical centre of the spherical lens.
2. The distances measured in the direction of incident light are taken as positive.
3. The distances measured in the direction opposite to the direction of incident light are taken as negative.
4. The heights measured upwards and perpendiculars to the principal axis of the lens are taken as positive.
5. The heights measured downwards and perpendiculars to the principal axis of the lens are taken as negative.

Test Your Understanding and Answer These Questions:

1. Write the New Cartesian Sign Conventions for refraction of light by spherical lenses?