1.

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 mirrorA) away from the screenB towards the screenC)either towards or away from the screen depending upon the position of the objectD)very far away from the screengive reasons toooooo

Answer»

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.


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