Class 10 - Physics - Chapter 12 - Lecture 9 Lenses (Lens Terminology) - Allied Schools 

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Sir i got 518 num in 9th board in physics 60/60 but in class 10th my sir stand me and ask can you explain the topic of lense but i didn't know about this topic and he ashamed me and then i watch your video

Way of teaching is appreciated 👏 But you made a little mistake Principal focus is +ve for convex lens and for concave lens it is -ve 6:45 - 7:02

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Sir is lactur ma ak jagha pa confusion ha apna phly bataya k convex lens ma principal focus negative hota ha or cancave ma positive magar book ma is k opposite ha

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Helpful lacture👍

sir but in spherical mirror we have studied that imaginary line are drawn in the case of convex lense because there rays are diverge ....but apny previous lecture mai jo image formation btaya hai wo spherical mirror k bilkul opposite hai asy tu ap concepts mix up kr rhy hai kindly aik chez btay

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Sir concave lens positive hota hai aur convex lens negative hota hai sir

Focal length of convex is +ve

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very good and helpful lecture

There is bit mistake that confuses me ..."concave focal length is positive while convex focal length is negative

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Firstly, you ask that cocave is +ve and then you say that convex focal length is +ve.. Why??

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Well explained.. But power of lens is not cleared

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I think Sir is himself confused about positive and negative focal length.

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sir ap ny ik mistake ki ha

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Good