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Question 10: NCERT Solutions for 12th Class Physics: Chapter 9-Ray Optics and Optical Instruments

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Question 10: NCERT Solutions for 12th Class Physics: Chapter 9-Ray Optics and Optical Instruments

What is the focal length of a convex lens of focal length 30 cm in contact with a concave lens of focal length 20 cm? Is the system a converging or a diverging lens? Ignore thickness of the lenses.

 

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  1. Solution:
    Equivalent focal length of the combination

    Hence, system will behave as a diverging lens of focal length 60 cm.

    Check the complete chapter with solutions.

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