Nilima Nilima
  • 0
Enlightened

A screen is placed 90 cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by 20 cm. Determine the focal length of the lens.

  • 0

A screen is placed 90 cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by 20 cm. Determine the focal length of the lens.

Related Questions

Leave an answer

Leave an answer

1 Answer

  1. Solution:
    The image of the object can be located on the screen for two positions of convex lens such that u and v are exchanged.
    The separation between two positions of the lens is x = 20 cm. It can be observed from figure.

    Check the complete chapter with solutions.

    NCERT Solutions for 12th Class Physics: Chapter 9-Ray Optics and Optical Instruments