जब प्रकाश एक काँच के प्रिज्म से होकर गुजरता है, तो प्रकाश का अपवर्तन कितनी बार होता है?

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?