What is focal length? October 10, 2024July 15, 2020 by Admin The distance between the pole and the principal focus of a spherical mirror is called the focal length of the mirror. Related Posts:What is the main focus of a spherical mirror?Why is convex mirror called a diverging mirror?Why doctors use concave mirror to observe eyes, ear,…Magnet Short Questions AnswerHow mirror can be identified by observing the values…What is focal plane?