12th Class Physics Ray Optics

  • question_answer 57)
          A short object of length L is placed along the principal axis of a concave mirror away from focus. The object distance is u. If the mirror has a focal length, what will be the length of the image? You ma; take .

    Answer:

                      Let the two ends of the object be at distances  and from the pole of concave minor, so that size of the object. Let the images of the two ends be formed respectively at  and  on reflection from the concave mirror  Size of image = From mirror formula,            or              and As the object is short and kept away from focus, therefore, . Hence,


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