Question 3 Page 184 - Chapter 10 Class 10 - Light - Reflection and Refraction

Last updated at May 29, 2023 by

Find the power of a concave lens of focal length 2 m.

 

Answer

Since focal length of concave lens is negative

Focal length = − 2m



We know that,

Power of a lens = 1/Focal Length

                          = 1/( − 2) 

                          = − 0.5 D

 

Power of a concave lens is − 0.5 D

Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class

Book a free demo
Ask a doubt
Maninder Singh's photo - Co-founder, Teachoo

Made by

Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo