2. Questions Bank
  3. JEE Main & Advanced
  4. Physics
  5. Ray Optics

JEE Main & Advanced Physics Ray Optics Question Bank Refraction at Curved Surface

  • question_answer
    We combined a convex lens of focal length f1 and concave lens of focal lengths f2 and their combined focal length was F.  The combination of these lenses will behave like a concave lens, if                                           [KCET 2000]

    A)            f1 > f2                                       

    B)            f1 < f2

    C)            f1 = f2                                       

    D)            f1 \[\le \] f2

    Correct Answer: A

    Solution :

               \[F=\frac{{{f}_{1}}{{f}_{2}}}{{{f}_{2}}-{{f}_{1}}},\] F will be negative if \[{{f}_{1}}>{{f}_{2}}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner