+2.0 D और −2.5 D क्षमताओं वाले दो लेंसों को मिलाकर एक प्रकाशीय उपकरण बनाया जाता है। यह संयोजन किस रूप में कार्य करेगा?

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?