Question

The refracive index of glass with respect to air is 3/2.if speed of glass in air is 3x10m/s.Find the speed of light in glass​

Answer 1

Answer:

2×10⁸m/s

Explanation:

Refractive index=speed of light in vacuum(or air)/speed of light in medium

3/2 = 3×10⁸/x

x=3×10⁸×2/3

x=2×10⁸ m/s

Answer 2

Given

• R = sin i/sin r
• R = Speed in 1st medium/Speed in 2nd medium

Solution

$\Longrightarrow{\mathsf{\frac{3}{2} = \frac{3 \times {10}^{8}}{Speed\:in\:2nd\:Medium}}} \\ \\ \Longrightarrow{\mathsf{Speed\:in\:2nd\:Medium = \frac{3 \times {10}^{8} \times 2 }{3}}} \\ \\ \Longrightarrow{\mathsf{Speed\:in\:2nd\:Medium = 2 \times {10}^{8}}}$

Since, here speed in 2nd Medium is none other than Glass.

Hence speed of light in Glass is 2 × 10^8 m/s.