Check sibling questions

Under which of the following conditions a concave mirror can form an image larger than the actual object?

(a) When the object is kept at a distance equal to its radius of curvature

(b) When object is kept at a distance less than its focal length

(c) When object is placed between the focus and centre of curvature

(d) When object is kept at a distance greater than its radius of

curvature

 

Answer

A concave mirror forms images larger than the object (with M agnification > 1 ) when the object is placed between C and F. 

  • When the object is placed between C and F, the image is formed beyond C
  • This means v > u.  
  • Since magnification, m = -v/u, and v > u, it is clear that |m|>1
  • The image formed is larger than the object. 

concave-mirror---object-between-c-&-f---teachoo.jpg

So, the correct answer is (c)

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CA Maninder Singh is a Chartered Accountant for the past 12 years and a teacher from the past 16 years. He teaches Science, Accounts and English at Teachoo