Question

Q3. Assertion: Light travels faster in glass than in air.
Reason: Glass is optically denser than air.​

Answer 1

Explanation:

Assertion is false.

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Answer 2

The Assertion is a false statement but the reason is the true statement.

• Light travels faster in the air than in glass as glass is optically denser than air.
• Different media have different optical densities and refractive indexes.
• Refractive index = speed of light in vacuum/ speed of light in the medium.
• Refractive index of glass > Refractive index of air
• Refraction or bending of light is observed when light travels from 1 media to another.
• As light travels from a vacuum or air into a medium like glass or water, the light bends towards the surface of the new media, and the speed of light decreases in the medium.