The index of refraction of light in medium and vacuum is given by?
Correct answer: A. n=c/v
- A. n=c/v
- B. n=v/c
- C. n=vc
- D. n=v.c
Explanation
This formula represents the index of refraction (n) of a medium, where c is the speed of light in a vacuum, and v is the speed of light in the medium. This formula is based on Snell's law, which relates the angle of incidence and refraction as light passes through a boundary between two different materials.
This question appeared on the ETEA MDCAT 2009 paper, which you can sit online with every answer explained.
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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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