General Science Jab Ek Vyakti Tivra Prakash Shetra Se andhere Kamre Karta Hai , To Use Kuch Samay Ke Liye Spashta Dikhayi Nahin Deta Hai , Baad Me Dhire - Dhire Use Cheejeen Dikhayi Dene Lagti Hai Iska Karan Hai ?

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