If l║m , then 1= 2 because they are
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The speed of light in water 2.25 × 10⁸ ms⁻¹.
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The refractive index of a medium for a light of given wavelength may be defined as the ratio of the speed of light in vacuum to its speed in that medium.
Refractive index = \frac{Speed\:of\:Light(Medium 1)}{Speed\:of\:Light(Medium2)}SpeedofLight(Medium2)SpeedofLight(Medium1)
Formulae :-
ngw = \dfrac{vg}{wg}wgvg
Factors on which the refractive index of a medium depends :-
1. Nature of the medium.
2. Wavelength of the light used.
3. Temperature.
4. Nature of the surrounding medium.
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