Question

explain the sign conventions of lens ?​

Answer 1

Answer:

The sign convention for lenses is similar to that for mirrors. Again, take the side of the lens where the object is to be the positive side. Because a lens transmits light rather than reflecting it like a mirror does, the other side of the lens is the positive side for images.

hope This is helpful.. ☺

thanks...

Answer 2

Answer:

For lenses, we follow sign conventions, similar to the one used for spherical mirrors. All measurements are taken from the optical centre of the lens which lies on the origin of x-y axis. According to the convention, the focal length of a convex lens is positive and that of a concave lens is negative.