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.
So, the correct answer is (c)
