CBSE Class 10 Science 2017 · Paper 531 · Question 16

Type of mirror: a concave mirror. Nature of the image: virtual, erect and magnified (enlarged), formed behind the mirror. Range of distance: the face must be between the pole and the principal focus of the mirror, that is, at a distance of less than 15 cm from the mirror. Ray diagram: with the face AB between P and F, a ray from A parallel to the principal axis is reflected through F, and a ray along the line from C is reflected back along itself. The reflected rays diverge; their backward extensions meet behind the mirror at A′, giving a virtual, erect, enlarged image A′B′. For example, with the face 10 cm away, $v=+30$ cm and $m=+3$.