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CBSE Class 10 Answered

1) Is R=2f applicable for mirror and lens both?
2)Is m=height of image/height of object applicable for both mirror and lens?
Urgent please thanks for assistance.
Asked by Kumar Harshvardhan | 11 Feb, 2015, 08:50: PM
answered-by-expert Expert Answer
  1. R= 2f is valid only for spherical (concave and convex) mirrors.
  2. The magnification formula for lenses differs only in sign from the magnification formula of mirrors.
    That is,
    For mirrors: begin mathsize 12px style straight m space equals space minus space straight v over straight u end style 
    For lenses: begin mathsize 12px style straight m space equals space straight v over straight u end style 

 

Answered by Yashvanti Jain | 11 Dec, 2017, 06:39: PM

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