Question

very.
6. Calculate the speed of light in glass of refractive index 1.5.
Given speed of light in air is 3 10 m/s.​

Answer 1

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Answer:

2 × 10^8 m/s

Explanation:

Refractive index of glass = 1.5

Speed of light in air = 3.0 x 10^8 m/s

We know that

Refractive index of glass = speed of light in air/speed of light in glass

1.5 = 3 x 10^8/speed of light in glass

Speed of light in glass = 2 x 10^8 m/s

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Answer 2

$\bigstar$ Given

Refractive index of glass is 1.5

Speed of light in air is 3 x 10⁸ m/s

$\bigstar$ To Find

The speed of light in glass

$\bigstar$ Solution

We know that

$\red{\sf \longrightarrow v=\dfrac{c}{\mu}}$

Here

• v = speed of light in glass
• c = speed of light in air
• μ = refractive index

According to the question

We are asked to find the speed of light in glass

Hence

We must find "v"

Given that

Refractive index of glass is 1.5

Speed of light in air is 3 x 10⁸ m/s

Hence

• c = 3 x 10⁸ m/s
• μ = 1.5

Substituting the values

We get

$\orange{\sf \longrightarrow v=\dfrac{3 \times 10^{8}}{1.5} \ m/s}$

On further simplification

We get

$\pink{\sf \longrightarrow v=2 \times 10^{8} \ m/s}$

Therefore

Speed of light in glass = 2 x  10⁸ m/s