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प्रश्न
State the speed of light in (a) air, (b) glass.
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उत्तर
(a) Air — 3 × 108
(b) Glass — 2 × 108
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संबंधित प्रश्न
Write true or false of the following statement.
The speed of light in vacuum is 3 × 108 ms-1.
State whether light slows down or speeds up in the following cases :
Light going from glass to water.
A light ray passes from water to
- air, and
- glass.
In each case, state how does the speed of light change.
The speed of light in air is 3 × 108 m s-1. Calculate the speed of light in glass. The refractive index of glass is 1.5.
Light travels ______ kilometers per second in air or vacuum. In theory, nothing can travel faster than light.
Materials that allow light to pass through completely are known as ______ material.
Materials that are not able to allow light to pass through, are called ______ material.
Materials that allow light to pass through completely are known as transparent materials.
Define transparent materials.
Two medium with a refractive index of 1.31 & 1.50 is given. In which case
- The bending of light is more and
- speed of light is more.
