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RAY OPTICS AND OPTICAL INSTRUMENTS — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsRAY OPTICS AND OPTICAL INSTRUMENTS2 Marks
Question
What is absolute refractive index? On what factors does it depend ?
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Answer

→The refractive index of a given medium with respect to vacuum is called its absolute refractive index.
$n =\frac{c}{v}$
→It is also equal to the ratio of speed of light in vacuum to speed of light in given medium.
→Refractive index is unitless.
→Dimensional formula: M0L0T0
→Value of refractive index of any medium depends on type of medium, temperature and wavelength of light.
→The refractive index of a medium and the wavelength of light in the same medium are inversely proportional to each other. $\left(n \propto \frac{1}{\lambda}\right)$

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