Question

THE SPEED OF LIGHT IN ETHANOL IS 2.21 * 10^8 M/S. WHAT IS ITS REFRACTIVE INDEX IF THE SPEED OF LIGHT IN AIR IS 3 * 10^8 M/S

Answer 1

Explanation:

Refractive index

n

of a material is a dimensionless number. It tells us how light propagates through that material.

n

≡

c

v

where

c

is the speed of light in vacuum

=

3

×

10

8

m

s

−

1

, and

v

is the phase velocity of light in the material.

Inserting given values we get refractive index of alcohol as

n

=

3

×

10

8

2.2

×

10

8

⇒

n

=

1.36

, rounded to two decimal places

Answer 2

Answer:

1.36

Explanation:

refractive index = speed of light in air/ speed of light in ethanol

= 3 * 10^8 / 2.21 * 10^8 = 1.357 ≈ 1.36

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