Q. If a flint lens glass of dispersive power 0.0666 renders achromatic to a convex lens of crown glass of focal length 60 cm and dispersive power 0.033, then its focal length is
A) -60 cm
B) +60 cm
C) -120 cm
D) +120 cm
Explanation
The correct answer is Option C: -120 cm.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.