JEE Main & Advanced Sample Paper JEE Main - Mock Test - 23

  • question_answer
    A concave mirror forms a real image, on a screen of thrice the linear dimension of a real object placed on its principal axis. The mirror is moved by 10 cm along its principal axis and once again a sharp image of the object is obtained on the screen. This time the image is twice as large as the object. Find the focal length of the mirror (in cm).



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