Question

The refractive index of glass is 1.5, velocity of light in glass is (A). 2.5x 1010 cm/sec( B). 2x 1010 cm/sec (C). 3.5 x 1010 cm/sec (D). 1.5 x 1010 cm/sec​

Answer 1

Answer:- 2 × 10^10 $\frac{cm}{second}$

Given parameters:

• Speed of light in vacuum (c) = 3 × 10^8 ms-1
• Refractive index of glass (ng) = 1.50

To Find out:

• The speed of light in the glass

Formula

• 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

Answer:

The speed of light in glass = v = 2 × 10^8 ms-1