If the object is kept in between pole and focus of a concave mirror, nature of image are

When the object AB is placed between the principle focus and the pole,

then the parallel ray of light AD passes through the focus F giving US the

reflected ray DX and the second ray AE passing through the centre of

curvature C is reflected along the same path forming the reflected ray EY.

Now because the reflected ray DX and EY are diverging away from each

other, so these cannot intersect each other in front of the mirror. So the

reflected rays DZ and EY are extended back ward by dotted lines. On

extending back words these rays appear to intersect each other at

point${\text{A}}^{\text{1}}$ behind the mirror. Thus the image formed in this case is behind the

mirror highly enlarged, virtual and erect.