Question

calculate the refractive index of water, if the speed of light in it is 2.25×10^8
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Answer 1

Answer:

Given:

• The speed of light in it is 2.25×10^8.

Find:

• Calculate the refractive index of water.

Using formula:

★ ${\sf{\underline{\boxed{\orange{\sf{Refractive \: index = \dfrac{Speed \: of \: light}{Speed \: in \:water}}}}}}}$

Note:

• Speed of light = 3 × 10^8.

Calculations:

⇒ $\bold{\dfrac{3 \times 10^{8}}{2.25 \times 10^{8}}}$

⇒ ${\sf{\underline{\boxed{\red{\sf{1.33}}}}}}$

Answer 2

Answer:

Refractive index = 1.333

Explanation:

Given :

• Speed of light in water = 2.25 10^8 m/s

To find :

• Refractive index of the water

We know that the speed of the light as calculated by the scientists is equal to 3×10^8 m/s and here we need to find the refractive index of water

Refractive index of water = speed of light in vaccum / speed of light in water

Refractive index of water = 3×10^8/2.25×10^8

Refractive index of water = 3/2.25

Refractive index of water = 1.333

Hence the refractive index of the water is equal to 1.333