# A student obtains a blurred image of an object on a sceen by using a concave mirror.in order to obtain a sharp image of the same object on the screen, he will have to shift the mirror A) away from the screen B towards the screen C)either towards or away from the screen depending upon the position of the object D)very far away from the screen give reasons toooooo

1
by dita

2015-04-12T01:54:32+05:30

### This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
1/f = 1/ u + 1/v

1/v = 1/f - 1/u      => v = u f / (u - f)

in a concave mirror with an inverted real image on screen, all quantities, v , f and u are negative. So the negative sign cancels out.

if  u increases a little, then v  decreases,  If u decreases then v increases.

Depending on the position of the object and screen with respect to the mirror, one may have to move in either direction.

Moving the mirror away or towards the object , could depend on the position of the object -- if it is outside the 2 * focal length distance or if the object is placed between the center of curvature and the principal focus point.