Can we prove f=r/2 for concave and covex lenses​​​​​​​​​​ ?If it can be proved, please prove it quickly.I have posted it many more times.

Please send the full solution as soon as possible 🙏

I got 80% in jee mains and am from sc category . Will i get a good NIT

Looking for an integrated JEE+NEET Coaching Classess for 2 years along with an ongoing normal syllabus related classes followed by regular revision tests, please.ThanksGopinath [F/O Class 10th Student-Qatar]

Ntse coaching for class 9 ncert student, fee and schedule

Can a class 9 student take admission in the course, 2- what is the duration and mode of full course ie how many student in one class.