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The refraction index of a rare medium with respect to a denser medium is

  1. 1
  2. greater than 1
  3. smaller than 1
  4. negative

Answer (Detailed Solution Below)

Option 3 : smaller than 1
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Detailed Solution

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CONCEPT:

  • Refraction of Light: The bending of the ray of light passing from one medium to the other medium is called refraction.

F1 J.K 8.5.20 Pallavi D3

  • The refraction of light takes place on going from one medium to another because the speed of light is different in the two media.
  • The greater the difference in the speeds of light in the two media, the greater will be the amount of refraction.
  • A medium in which the speed of light is more is known as an optically rarer medium and a medium in which the speed of light is less is known as an optically denser medium.

EXPLANATION:

  • The medium having more refractive index compared to other medium is called the optically denser medium and the other medium is optically rarer medium.
  • As we know, the value of the refraction index of a rare medium is less than that of a denser medium. Therefore the refraction index of a rare medium with respect to a denser medium is less than one. Hence option 3 is correct.
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