Company Law: Share Capital vs Authorized Capital, Khauff Lagta Hai

Yaar samajh nahi aaya, koi batao. In dono concepts mein mujhe confusion hai, pehle Judicial Services ka exam dekh kar khada hai. Share Capital aur Authorized Capital ke beech kya farq hai? Kya ye dono hi ek hi cheez hain? Share Capital kehne ke bad bhi company ko koi aur capital authorize kar sakti hai, to kya wo Authorized capital hai, ya share capital? Koi example dekh kar samajhaya hai ki Share capital 10 lac, authorized capital 50 lac hai. Lekin phir company ko ye 50 lac ka capital dene ka option hua, to kya ye share capital ki increase hai, ya authorized capital ko badalne ka option hai?