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Question 7: NCERT Solutions for 12th Class Physics: Chapter 9-Ray Optics and Optical Instruments

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Question 7: NCERT Solutions for 12th Class Physics: Chapter 9-Ray Optics and Optical Instruments

Double-convex lenses are to be manufactured from a glass of refractive index 1.55, with both faces of the same radius of curvature. What is the radius of curvature required if the focal length is to be 20 cm?

 

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  1. Solution:
    Both faces should be of same radius of curvature

    So, the radius of curvature should be 22 cm for each face of lens.

    Check the complete chapter with solutions.

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