question_answer 15)

An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed, so that a sharp focused image can be obtained? Find the size and the nature of the image.

Answer:

                Here, object size  object distance                 focal length  image distance As                                                  Therefore, the screen should be held in front of the mirror at a distance of 54 on from the mirror. The image obtained on the screen will be real. As                                      Negative sign of  shows that the image is inverted.