Question

what is meant by power of a lens? what does it's sign (+ve or -ve)indicate

Answer 1

Hello!!!!!



power of lens is reciprocal of focal length.



its s i unit is dioptre.




negative sign indicate that it is concave lens.




positive sign indicate that it is convex lens.



hope it helps!!!!


#ranjandas1

Answer 2

-ve means moipia(concave lence) and +ve me means hypermetropia(convex lens)