जब एक प्रकाश किरण एक समतल दर्पण से 30° परावर्तन कोण पर परावर्तित होती है, तो परावर्तन के बाद किरण का विचलन कोण (angle of deviation) कितना होता है?

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?