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
    Two lenses of power +12 and - 2 diopters are placed in contact. What will the focal length of combination [MP PET 1990; MNR 1987; MH CET (Med.) 2001; UPSEAT 2000; Pb. PMT 2003]

    A) 10 cm                                      

    B) 12.5 cm

    C) 16.6 cm                                   

    D) 8.33 cm

    Correct Answer: A

    Solution :

    Power of the combination \[P={{P}_{1}}+{{P}_{2}}\]    \[=12-2=10\,D\]                    \ Focal length of the combination             \[F=\frac{100}{P}=\frac{100}{10}=10\,cm\]


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