लेंस तथा दर्पण का संयोजन,combination of lens and mirror,अवतल लेंस की फोकस दूरी,focal length of conca

[@kamalkishorchaudhry]

Thanks sir

[@dhanwantSir]

Your welcome dear 💗

[@neeruyadav4947]

Maja kar diyo sir ji

[@dhanwantSir]

😂

[@dhanwantSir]

Thanks for watching me my dear student your important feedback is write here ✍️👍

[@santossharma9302]

Thank you so much sir 🤗

[@dhanwantSir]

Your welcome dear

[@santossharma9302]

😇

[@tanusingh1943]

Thanks sir

[@dhanwantSir]

Your welcome Tanu

[@Satyamsinghpatel-f6m]

🙏🙏

[@habeebansari3565]

Very nice sir

[@dhanwantSir]

Thanks Habeeb Ansari

[@sumitpandey8321]

Oooooh

[@Yaduvanshi91713]

Noise pollution hai sir bhut shant place me phdaiye

[@dhanwantSir]

Thanks Anjali for your important feedback next time I will try👍

[@tellyserials8888]

Hi

[@kamalkishorchaudhry]

Thanks sir