Question

Light enters from air to glass plate having 1.50 refractive index
What is the speed of light in glass? (Given - speed of light in
vacuum 3x108 m/sec)​

Answer 1

GiveN :-

• Light enters from air to glass plate having 1.50 refractive index .
• The speed of light in vacuum 3x10⁸ m/s.

To FinD :-

• The speed of light in glass .

SolutioN :-

Given that ,Light enters from air to glass plate having 1.50 refractive index . The speed of light in vacuum 3x10⁸ m/s.

As we know that the refractive index of is defined as the speed of light in a vaccum to the speed of light in a particular medium .

$\sf:\implies \pink{ Refractive \ Index \ = \dfrac{Speed \ of \ light \ in \ vaccum }{Speed\ of \ light \ in \ med^m }}\\\\\sf:\implies \mu =\dfrac{c}{v}\\\\\sf:\implies 1.5 = \dfrac{3\times 10^8 m/s}{v} \\\\\sf:\implies v = \dfrac{3\times 10^8 m/s}{1.5} \\\\\sf:\implies\underset{\blue{\sf Required \ Speed }}{\underbrace{\boxed{\pink{\frak{ Speed_{(glass)}= 2\times 10^8 m/s }}}}}$