2. Questions Bank
  3. 10th Class
  4. Science
  5. Light - Reflection and Refraction

10th Class Science Light - Reflection and Refraction Question Bank Light - Reflection and Refraction

  • question_answer
    In which of the following is the focal length always positive?

    A) Plane mirror     

    B) Concave lens   

    C) Convex lens     

    D) All of the above

    Correct Answer: C

    Solution :

    Focal length is always positive for a convex lens.


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