21. position and nature of image.What is meant by power of a lens? What does its sign (+ve or - ve) indicate? State its SI unit.How is this unit related to focal length of a lens?

21. position and nature of image.What is meant by power of a lens? W

1.	21. position and nature of image.What is meant by power of a lens? What does its sign (+ve or - ve) indicate? State its SI unit.How is this unit related to focal length of a lens?
Answer» PLEASE MAKES ME BRILLIANT Explanation:+ve indicates POSITIVE and - ve is indcate negative

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21. position and nature of image.What is meant by power of a lens? What does its sign (+ve or - ve) indicate? State its SI unit.How is this unit related to focal length of a lens?​

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21. position and nature of image.What is meant by power of a lens? What does its sign (+ve or - ve) indicate? State its SI unit.How is this unit related to focal length of a lens?