एक अवतल लेंस −10 सेमी की दूरी पर एक आभासी प्रतिबिंब बनाता है जब वस्तु को लेंस के सामने 30 सेमी की दूरी पर रखा जाता है। लेंस की फोकस दूरी क्या है?

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?