पेरिस्कोप बनाने में कौन - सा एक प्रयुक्त होता है ? - Which one is used to make periscope? - Periscope Banane Me Kaun - Saa Ek Prayukt Hota Hai ? General Science in hindi, Physics Avtal Lens question answers in hindi pdf Samtal Darpan questions in hindi, Know About Avtal Lens General Science online test General Science notes in hindi quiz book Inme Se Koi Nahin
A B ka option ek hai