Q

Which statement describes the aperture-to-radius-of-curvature relation assumed for a thin lens in elementary ray optics?

RRB JE (Stage-I) 17/12/2024 / Shift-I 2024
✓ Answer: A Aperture is much smaller than the radius of curvature
The source assumes a small aperture relative to surface curvature for paraxial optics. Strictly, thinness refers to lens thickness, while a small aperture is a separate approximation.