The distance between the optical center and the principal focus is called ____?
The distance between the optical center and the principal focus is called ____?
آپٹیکل سینٹر اور پرنسپل فوکس کے درمیان فاصلے کو ____ کہا جاتا ہے؟
Explanation
Focal length is the distance between the optical center of a lens or mirror and its principal focus.It determines how strongly the lens or mirror converges or diverges light.