# If in a medium, the speed of light is 1.5 × 108 m/s how much will the absolute refractive index of that medium be? - Science and Technology 1

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If in a medium, the speed of light is 1.5 × 108 m/s how much will the absolute refractive index of that medium be?

Solve the example.
If the speed of light in a medium is 1.5 × 108 m/s, what is the absolute refractive index of the medium?

#### Solution 1

$\text{ Absolute refractive index of a medium } , \mu = \frac{\text{ Speed of light in air} }{\text{ Speed of light in the medium } }$
$\Rightarrow \mu = \frac{3 \times {10}^8}{1 . 5 \times {10}^8} = 2$

#### Solution 2

Given: Speed of light in medium (v2) = 1.5 × 108 m/s,
velocity of light in vacuum (v1) = 3 × 108 m/s

To find: Absolute refractive index (n)

Formula: n = "v"_1/"v"_2

Calculation: From the formula,

n = (3 xx 10^8)/(1.5 xx 10^8) = 2

The absolute refractive index of the medium is 2.

Concept: Refractive Index
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Chapter 6: Refraction of light - Solve the following Questions

#### APPEARS IN

Balbharati Science and Technology Part 1 10th Standard SSC Maharashtra State Board
Chapter 6 Refraction of light
Exercises | Q 4.1 | Page 79
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