Question

what is refractive index?​

Answer 1

ANSWER

The refractive index of the second medium with respect to the first medium is given by the ratio of the magnitude of the velocity of light in medium first to that in 2

nd

medium. It is represented by

1

η

2

.

Refractive Index=

Velocity of light in second medium

Velocity of light in first medium

i.e.,

1

η

2

=

v

2

v

1

and

2

η

1

=

v

1

v

2.

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.

Answer 2

Answer:

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