Q3 of 27 Page 383

The refractive index of glass is 1.5. What is the speed of light in glass? (Speed of light in vacuum is 3.0 × 108 m s–1)

Given:


Refractive index of glass (μ) = 1.5


v = Velocity of light in a medium


Now, the Refractive index of medium is given as,



According to the formula,



v = 2 × 108 m/s.


Speed of light in glass is 2 × 108 m/s.


More from this chapter

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1

Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are the wavelength, frequency and speed of (a) reflected, and (b) refracted light? Refractive index of water is 1.33.

 2

What is the shape of the wave-front in each of the following cases:

(a) Light diverging from a point source.


(b) Light emerging out of a convex lens when a point source is placed at its focus.


(c) The portion of the wave-front of light from a distant star intercepted by the Earth

 3

Is the speed of light in glass independent of the colour of light? If not, which of the two colours red and violet travels slower in a glass prism?

 4

In a Young’s double-slit experiment, the slits are separated by 0.28 mm and the screen is placed 1.4 m away. The distance between the central bright fringe and the fourth bright fringe is measured to be 1.2 cm. Determine the wavelength of light used in the experiment.