Q. The ratio of the speed of light in vacuum to the speed of light in a medium is called the medium's __________.

निर्वात में प्रकाश की गति और किसी माध्यम में प्रकाश की गति के अनुपात को माध्यम का __________ कहा जाता है।

Wavelength
वेवलेंथ

Frequency
आवृत्ति

Refractive index
अपवर्तनांक

Optical density
ऑप्टिकल घनत्व

The refractive index (n) is defined as:

n = \frac{c}{v}

where:

It indicates how much light slows down in the medium.

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