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Doubt & Answer Explanation

Doubt

the image formed by a concave mirror:
  1.  is always real
  2. is always virtual
  3. is certainly real if the object is virtual
  4. is certainly virtual if object is  real.

Answer Explanation

This chapter explains the concepts related to a concave mirror in detail: http://www.topiitcoaching.com/lesson/index/111/Ray Optics/59

The answer is definitely not a), b) or d) . This is because the image formed can be real as well as virtual depending on where the object is placed - so options a), b)  and d) are ruled out.

Option c) is also wrong! This is because it does not matter whether the object is real or virtual - the same cases that are applicable for a real object will be applicable for a virtual object. (A virtual object is simply an image formed by another lens or a mirror that is now being used as an object for our experiment.)

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