कैलीडोस्कोप (बहुरूपदर्शक) के अंदर बनने वाले रंगों के बदलते पैटर्न मुख्य रूप से निम्नलिखित में से किस प्रकाशीय परिघटना पर आधारित होते हैं?

Which Indian independence movement leader was primarily known for his philosophy and practice of non-violent civil disobedience?

Who gave the call for 'Do or Die' during the Quit India Movement in 1942?

Which of the following revolutionary pairs were imprisoned together in Cellular Jail and faced harsh conditions, contributing significantly to the Indian independence movement?