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
    The power of an achromatic convergent lens of two lenses is + 2D. The power of convex lens is + 5D. The ratio of dispersive power of convex and concave lens will be       [Pb. PET 2003]

    A)            5 : 3                                          

    B)            3 : 5

    C)            2 : 5                                          

    D)            5 : 2

    Correct Answer: B

    Solution :

                       \[{{P}_{1}}+{{P}_{2}}=2D\] and \[{{P}_{1}}=5\,D,\] so \[{{P}_{2}}=-\,3\,D\] For achromatic combination \[\frac{{{\omega }_{1}}}{{{\omega }_{2}}}=\left( -\frac{{{p}_{2}}}{{{p}_{1}}} \right)\]\[=-\,\left( \frac{-\,3}{5} \right)=\frac{3}{5}\]


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