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Q.

A ray of light travelling from the air is incident on a glass slab. How is the refractive index of glass calculated in terms of the speed of light in air and glass?

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a

Ratio of speed of light in vacuum to the speed of light in glass.

b

Angle of incidence ray is equal to angle of Refracted ray

c

Both 1&2

d

None of the above

answer is A.

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Detailed Solution

The refractive index of glass is calculated as the ratio of the speed of light in a vacuum to the speed of light in glass.
Passing through a rectangular glass slab, a ray of light undergoes two refractions and emerges from the opposite side of the slab in a direction parallel to the direction of the incidence of light.
The glass refractive index is defined as the ratio between the speed of light in the vacuum and the speed of light in the glass.

Refractive index of glass (ng) = \frac{speed of light in vaccum}{speed of light in glass slab}

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