![SOLVED: What is meant by power of a lens? Write its SI unit. A student uses a lens of focal length 40 cm and another of −20 cm. Write the nature and SOLVED: What is meant by power of a lens? Write its SI unit. A student uses a lens of focal length 40 cm and another of −20 cm. Write the nature and](https://cdn.numerade.com/ask_previews/70554104-4ed6-4810-be59-b7df7d8d2cb7_large.jpg)
SOLVED: What is meant by power of a lens? Write its SI unit. A student uses a lens of focal length 40 cm and another of −20 cm. Write the nature and
![Focal Length Formula & Examples | How to Calculate Focal Length - Video & Lesson Transcript | Study.com Focal Length Formula & Examples | How to Calculate Focal Length - Video & Lesson Transcript | Study.com](https://study.com/cimages/multimages/16/camerafocus.jpg)
Focal Length Formula & Examples | How to Calculate Focal Length - Video & Lesson Transcript | Study.com
![Define power of a lens. What is its unit ? One student uses a lens of focal length `50 cm` - YouTube Define power of a lens. What is its unit ? One student uses a lens of focal length `50 cm` - YouTube](https://i.ytimg.com/vi/heobC--rq3c/maxresdefault.jpg)
Define power of a lens. What is its unit ? One student uses a lens of focal length `50 cm` - YouTube
What is meant by power of a lens ? Write the SI unit. A student uses a lens of focal length 40 cm and another of - 20 cm. - Sarthaks eConnect | Largest Online Education Community
![Focal Length Formula & Examples | How to Calculate Focal Length - Video & Lesson Transcript | Study.com Focal Length Formula & Examples | How to Calculate Focal Length - Video & Lesson Transcript | Study.com](https://study.com/cimages/videopreview/sithb8dop8.jpg)
Focal Length Formula & Examples | How to Calculate Focal Length - Video & Lesson Transcript | Study.com
![Focal length, explained by RP Photonics Encyclopedia; focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius Focal length, explained by RP Photonics Encyclopedia; focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius](https://www.rp-photonics.com/previews/focal_length.png)
Focal length, explained by RP Photonics Encyclopedia; focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius
![Focal Length Formula & Examples | How to Calculate Focal Length - Video & Lesson Transcript | Study.com Focal Length Formula & Examples | How to Calculate Focal Length - Video & Lesson Transcript | Study.com](https://study.com/cimages/multimages/16/1curvedmirror8320996962080431235.png)
Focal Length Formula & Examples | How to Calculate Focal Length - Video & Lesson Transcript | Study.com
![What is meant by power of a lens Write its SI unit A student uses a lens of focal length 40 cm and another of 20 cm Write the nature and power What is meant by power of a lens Write its SI unit A student uses a lens of focal length 40 cm and another of 20 cm Write the nature and power](https://api.flasheducation.co.in/media/images/2020/09/02/image_o3D44AE.png)