Question

light enters from the air to glass having refractive index 1.50 calculate the speed of light in the glass
given :: the speed of light in vacuum is = 3' 10 8' m/s

Answer 1

Explanation:

Speed of light in vacuum (c) = 3 × 108 ms-1

Refractive index of glass (ng) = 1.50

Refractive index of a medium = Speed of light in vacuum/Speed of light in the medium

Refractive index of glass = Speed of light in vacuum/Speed of light in the glass

Speed of light in the glass (v) = Speed of light in vacuum/ Refractive index of glass

v = c/ng

v = (3 × 108)/1.50

v = 2 × 108 ms-1

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Answer 2

Answer:-

$\red{\bigstar}$ Speed of light in glass

$\large\leadsto\boxed{\sf \purple{2 × 10^8 \: m/s}}$

• Given:-

Refractive index of glass = 1.50

Speed of light in vaccum = $\bf{3 \times 10^8}$

• To Find:-

Speed of light in glass = ?

• Solution:-

We know,

$\pink{\bigstar}$

$\boxed{\sf \red{Refractive \: index = \dfrac{Speed \: of \: light \: in \: vaccum}{Speed \: of \: light \: in \: medium}}}$

Hence,

→ $\sf{1.50 = \dfrac{3 \times 10^8}{Speed \: of \: light \: in \: glass}}$

→ $\sf{Speed \: of \: light \: in \: glass = \dfrac{3 \times 10^8}{1.50}}$

→ $\sf{Speed \: of \: light \: in \: glass = 2 \times 10^8}$

Therefore, the speed of light in glass is $\bf \pink{2 \times 10^8 \: m/s}$.