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The speed of light in vacuum is:
1. 3 × 1010 m / s 
2. 3 × 108 m / s 
3. 2 × 108 m / s 
4. 2.25 × 108 m / s

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Correct Answer - Option 2 : 3 × 108 m / s 

The correct answer is 3 × 108 m / s.

  • Light
    • Light is a form of energy that makes us see.
    • An object reflects the light that falls on it.
    • This reflected light when received by our eyes enables us to see the object.
    • The speed of light in a vacuum or the air is 3 x 108 m / s and it is different in different media.
    • Light travels in a straight line.
    • The speed and wavelength of light change when it travels from one medium to another but frequency remain unchanged.


Speed of light in some common media


Speed of Light


3*108 m/s


2.25*108 m/s


2*108 m/s

Rock Salt

1.96*108 m/s


1.96*108 m/s

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