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

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Thanks sir bilkul clear topic samhaj a gaya thanks 👍❤

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[@sanaAli116-wz9he]

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[@budgieslover357]

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

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Helpful lacture👍

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[@Armylover_5656]

Focal length of convex is +ve

[@user-zc3gt8sc5r]

yes

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[@shumailmunir3163]

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[@nusratbanibano2190]

very good and helpful lecture

[@KhanKhan-px9hy]

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

[@muhammadrustam2382]

gg sir sy mistake ho gai hogi its ok

[@adnanmughal1660]

Sir aap Sy mistake ho Gai hai but it's ok 🥰🥰

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[@Armylover_5656]

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

[@MrsBakar2305]

Same question

[@rimshasaleem9609]

Yes same question

[@imranrind9393]

Sir made a mistake here
Actually focal length of Convex is negative but it's power of lens is positive because focal length an is inversely proportional to power of a lens I hope you get it

[@emanfatima2605]

​@@imranrind9393wrong

[@saadchachar4078]

Focal length of convex lens is positive. Focal length of concave lens is negative

[@ayeshaashraf5894]

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[@bilqeesrafaqatrana8619]

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[@muhammadabdullaha3387]

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[@user-xg4uk8cc9o]

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

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Amazing

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Rajab family members

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F

[@tastyfoodwithfatimaqayyum6672]

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[@barkaali]

sir g first year ka bhi phryn

[@entertainmenthub1358]

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

[@user-ye7lf3uz5s]

Good teaching method 👍

[@emanfatima2605]

Well explained.. But power of lens is not cleared

[@kashifjan1707]

sir 6:55 aur 11:25 mints p ap k statement Smjh se baahir hen plz Go saky to Saaf saaf Samjhaiye

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[@tastyfoodwithfatimaqayyum6672]

Sir yek question hia

[@user-wm5hq2gv3t]

Sir please clear my concept 😊😢

[@user-wm5hq2gv3t]

Assalamoalaikum sir😊

[@user-wm5hq2gv3t]

Sir convex lens ka focal point tu real hai isiliye uska focal length b real hoga
Similarly concave lens ka focal point virtual hai isiliye uska focal length b real hoga

[@user-wm5hq2gv3t]

Sorry concave lens ka focal length virtual hoga

[@user-wm5hq2gv3t]

Because real objects or things will always taken as positive and virtual objects or things or images etc are taken as negative

[@user-wm5hq2gv3t]

Sir please clear my concept 😢😊

[@muhammadrustam2382]

sir ap ny ik mistake ki ha

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[@rimshaafzal8154]

Good