Question

define refractive index
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Answer 1

Answer:

the ratio of the velocity of light in a vacuum to its velocity in a specified medium.

Explanation:

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Answer 2

Answer:

Refractive Index : The ratio of the velocity of light in a vacuum to its velocity in a specified medium.

Explanation:

Some typical refractive indices for yellow light (wavelength equal to 589 nanometres [10−9 metre]) are the following: air, 1.0003; water, 1.333; crown glass, 1.517; dense flint glass, 1.655; and diamond, 2.417. The variation of refractive index with wavelength is the source of chromatic aberration in lenses. The refractive index of X-rays is slightly less than 1.0, which means that an X-ray entering a piece of glass from air will be bent away from the normal, unlike a ray of light, which will be bent toward the normal. The equation n = c/v in this case indicates, correctly, that the velocity of X-rays in glass and in other materials is greater than its velocity in empty space.

It will be more clear by following diagram :