फोकस दूरी तथा वक्रता त्रिज्या में संबंध।

[@raazsurya5575]

Good 👍

[@amnesh7857]

Thank you sir🎉🎉 knowledgeable

[@Virendra1213-d2p]

Thank you sir ji

[@Virendra1213-d2p]

Sir next video jaldi upload kar do

[@Rahul_14386]

Dhanyawad sir