Q. 8

State and explain the New Cartesian Sign Convention for spherical lenses.

Answer :

Following sign convention is used for measuring various distances during the formation of images by lenses:

(ii) The distances measured in the same direction as that of incident light are taken as positive.


(iii) The distances measured against the direction of incident light are taken as negative.




● All distances on the principal axis are measured from the optical center.


● The distances measured in the direction of incident rays are positive and all the distances measured in the direction opposite to that of the incident rays are negative.


● All distances measured above the principal axis are positive. Thus, height of an object and that of an erect image are positive and all distances measured below the principal axis are negative.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Quiz | Refraction of LightQuiz | Refraction of LightQuiz | Refraction of Light40 mins
Refraction of LightRefraction of LightRefraction of Light48 mins
Lets Learn Refraction of LightLets Learn Refraction of LightLets Learn Refraction of Light42 mins
Lets learn Refraction of LightLets learn Refraction of LightLets learn Refraction of Light42 mins
Lakhmir Singh | Refraction  of Light (Part-3)Lakhmir Singh | Refraction  of Light (Part-3)Lakhmir Singh | Refraction of Light (Part-3)42 mins
Lakhmir Singh | Refraction of LightLakhmir Singh | Refraction of LightLakhmir Singh | Refraction of Light33 mins
Introduction to Spherical LensIntroduction to Spherical LensIntroduction to Spherical Lens42 mins
NCERT | Light- Reflection and Refraction (Part -1)NCERT | Light- Reflection and Refraction (Part -1)NCERT | Light- Reflection and Refraction (Part -1)37 mins
Foundation | How to Solve Numericals on Mirror FormulaFoundation | How to Solve Numericals on Mirror FormulaFoundation | How to Solve Numericals on Mirror Formula58 mins
NCERT | Power of a LensNCERT | Power of a LensNCERT | Power of a Lens31 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses