What is the difference between absolute refractive index and relative refractive index?

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Jasmine Grover

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The absolute refractive index and the relative refractive index are two different measures of the refractive properties of a material.

Absolute Refractive Index

The absolute refractive index, also known as the refractive index, is a measure of how much a material slows down light as it passes through it.

  • It is defined as the ratio of the speed of light in a vacuum to the speed of light in the material.
  • The absolute refractive index is denoted by the symbol "n", and it is a unitless quantity.
  • The absolute refractive index is a fundamental property of a material, and it depends on the chemical composition and physical structure of the material.

absolute and relative refractive index

Relative Refractive Index

The relative refractive index, on the other hand, is a measure of the difference in refractive index between two materials.

  • It is defined as the ratio of the absolute refractive index of one material to the absolute refractive index of another material.
  • The relative refractive index is denoted by the symbol "n", and it is a unitless quantity.
  • The relative refractive index is used to compare the refractive properties of different materials, and it is often used in optics and materials science.

In summary, the absolute refractive index is a measure of how much a material slows down light, while the relative refractive index is a measure of the difference in refractive index between two materials.

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CBSE CLASS XII Related Questions

  • 1.
    Two heaters rated as \((P_1,V)\) and \((P_2,V)\) are connected in series across a dc source of \(V/2\) volt. The power consumed by the combination will be –

      • \((P_1+P_2)\)
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    • 2.
      Draw a circuit diagram of a full-wave rectifier using p-n junction diodes. Explain its working and show the input-output waveforms.


        • 3.
          Assertion (A) : The mass of a nucleus is less than the sum of the masses of the constituent nucleons. Reason (R) : Energy is absorbed when the nucleons are bound together to form a nucleus.

            • Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
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            • Both Assertion (A) and Reason (R) are false.

          • 4.
            The figure shows three point charges kept at the vertices of triangle ABC. The net electric field, due to this system of charges, at the midpoint M of base BC will be:

              • \( \frac{q}{4 \pi \epsilon_0 l^2} \) pointing along MA
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              • Zero

            • 5.
              Draw the number of scattered particles versus the scattering angle graph for scattering of alpha particles by a thin foil. Write two important conclusions that can be drawn from this plot.


                • 6.
                  What is displacement current (\( i_d \))? Considering the case of charging of a capacitor, show that \( i_d = \varepsilon_0 \frac{d\Phi_E}{dt} \). What is the value of \( i_d \) for a conductor across which a constant voltage is applied?

                    CBSE CLASS XII Previous Year Papers

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