Question

the speed of light in vaccum is 3×10^m/s. Find the speed of light in glass of refractive index 1.5.​

Answer 1

Answer :

• Speed of light in glass is 2 × 10^(8) m/s

Explanation :

• Speed of light in vacuum = $\sf{3 \: \times \: 10^8 \: ms^{-1}}$

• Refractive Index (μ) = 1.5

$\rule{150}{0.5}$

Use formula for Refractive Index :

$\longrightarrow \sf{\mu \: = \: \dfrac{Speed \: of \: light \: in \: vaccum}{Speed \: of \: light \: in medium}}$

Here, Medium is Glass

$\longrightarrow \sf{1.5 \: = \: \dfrac{3 \: \times \: 10^8}{Glass}} \\ \\ \longrightarrow \sf{Glass \: = \: \dfrac{3 \: \times \: 10^8}{1.5}} \\ \\ \longrightarrow \sf{Glass \: = \: 2 \: \times \: 10^8} \\ \\ \underline{\underline{\sf{Speed \: of \: light \: in \: Glass \: is \: 2 \: \times \: 10^8 \: ms^{-1}}}}$