MPSC PYQScienceLightenglish22) What is the power of a lens if the focal length of a concave mirror is 20cm ? 1) 1 D 2) 2.5 D 3) 5 D 4) NoneA.1 DB.2.5 DC.5 DD.NoneCorrect answer: CSource paperScience: LightPractice more questions