Question

an object is placed 10cm in the front of concave mirror of focal length 15 cm what is the magnification of image

Answer 1

Sol: Using Mirror Formula
        1/ v = 1/f - 1/u
          1/v = 1/15 - (-1/10)
          1/v = 1/15 +1/10
           1/v = (2+3)/30
           1/v = 5/30
            v= 30/5=  6cm

           m = -v/u
           m = -(6)/-10
           m = 6/10  = 0.6   ................ Ans