30. Why are concave mirrors used in a solar furnace? 31. Why do we prefer a convex mirror as a rear-view mirror in vehicles? 32. Draw the following diagram, in which a ray of light is incident on a concave/convex mirror, on your answer sheet. Show the path of this ray, after reflection, in each case. +++ 33. The image formed by a concave mirror is observed to be virtual, erect and larger than the object. where should be the position of object ?Justify your answer.