A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called______________?
Correct answer: B. focus
- A. center of curvature
- B. focus
- C. optical center
- D. aperture
Explanation
The focus is the point where rays parallel to the principal axis actually meet after a converging lens or appear to originate after a diverging lens. The optical centre is only the point through which a central ray passes approximately undeviated. The likely mistake is choosing c, because the optical centre is a location on the lens, not the convergence or apparent-divergence point.
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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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