Question

Light enters from air to glass having refractive index
1.50. What is the speed of light in the glass? The speed
of light in vacuum is 3 x 10⁸ ms-¹.​

Answer 1

Answer:-

• Speed of light in air=C=3×10^8m/s
• Refractive index of light=n=1.5
• Speed of light in glass=V

We know

$\boxed{\sf n=\dfrac{C}{V}}$

$\\ \sf\dashrightarrow 1.5=\dfrac{3\times 10^8m/s}{V}$

$\\ \sf\dashrightarrow V=\dfrac{3\times 10^8m/s}{1.5}$

$\\ \sf\dashrightarrow V=2\times 10^8m/s$