Q. Two lenses having $f_{1}:f_{2} = 2\ :3$ has combination to make no dispersion. Find the ratio of dispersive power of glasses used
A) $2\ :3$
B) $3\ :2$
C) $4\ :9$
D) $9\ :4$
Explanation
(a) $\frac{\omega_{1}}{\omega_{2}} = - \frac{f_{1}}{f_{2}} = - \frac{2}{3}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.