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Q.

The speed of light in a glass slab is ______ compared to that in the air.

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a

Larger

b

Smaller

c

Neutral

d

None of these

answer is B.

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Detailed Solution

Concept: The speed of light in vacuum, commonly denoted c, is a universal physical constant that is important in many areas of physics.
Its exact value is defined as 299792458 metres per second (approximately 300000 km/s or 186000 m/s)
And as we know n =

\frac{c}{v}

where c is the speed of light and n is the refractive index of the medium and v is the speed of light in that medium.
Here the refractive index of vacuum is 1 and that of glass is 1.5. hence speed of light is less in glass as compared to vacuum.
Hence, option 2 is correct.

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