CBSE Class 12-science Answered
Expert Answer
Focal length is a geometric property of the concave mirror, and depends upon the radius of curvature. NO DEPENDENCE ON THE WAVELENGTH OF INCIDENT LIGHT.
Refractive index is a measure of how much speed of light reduces while travelling thorugh a medium.
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Refractive index, is the ratio of speed of light in vacuum to speed of light in medium.
It's also called absolute refractive index, since it's measured with respect to vacuum.
It we take the ratio of refractive indices of two different media, we get ratio of speed of light in one medium to the speed in second medium.
It's called relative refractive index.
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