To determine the approximate value of the focal  length of a given concave mirror, you focus the  image of a distant object formed by the mirror on a screen. The image obtained on the screen, as  compared to the object is always:  

(a) Laterally inverted and diminished  

(b) Inverted and diminished  

(c) Erect and diminished  

(d) Erect and highly diminished  



  • When the object is at infinity
  • the image formed by the concave mirror will be diminished and inverted
  • And it is formed at the focus of the mirror.



So, the correct answer is (b) - inverted and diminished

  1. Class 10
  2. Chapter 10 Class 10 - Light - Reflection and Refraction (Term 1)

About the Author

CA Maninder Singh's photo - Founder at Teachoo
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo