पिनहोल कैमरा (सूचीछिद्र कैमरा) द्वारा निर्मित प्रतिबिंब की विशेषताएं क्या होती हैं?

The Dandi March, also known as the Salt Satyagraha, was led by which influential leader?

Which act formally granted independence to India, marking the end of British rule?

Who was the key figure in establishing the Indian National Congress?