If a convex lens of large aperture fails to converge the light rays incident on it to a single point, it is said to suffer from______________?
Correct answer: B. spherical aberration
- A. chromatic aberration
- B. spherical aberration
- C. both spherical and chromatic
- D. distortion
Explanation
Spherical aberration occurs because rays striking different zones of a large-aperture spherical lens are brought to different focal points, so they do not meet at one point. Chromatic aberration instead results from different colours having different refractive indices and focal lengths. The likely mistake is choosing c, because a large aperture points specifically to spherical aberration, not automatically to chromatic aberration.
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About Optics
Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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