The speed of light will be minimum while passing through ?
Correct answer: B. Glass
- A. Vaccum
- B. Glass
- C. Water
- D. Air
Explanation
The speed of light in a medium is v = c/n, so it is least in the medium with the greatest refractive index. Glass generally has a higher refractive index than water, air, or vacuum, so light travels slowest in glass. The likely choice is c, because students may select vacuum by confusing least light speed with the absence of a medium.
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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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