Spherical aberration using image formed by a spherical surface of a distance object https://www.youtube.com/watch?v=qJfCGSeF0JY https://www.slideshare.net/askiitians1/reflection-of-light-by-spherical-mirrors-physics?qid=3acec7dc-0501-4fcb-b36d-e7a568f815c8&v=&b=&from_search=6 Practice 3: Image formation by spherical mirrors https://www.youtube.com/watch?v=nT6nSlZ0FIQ