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The speed of light in air is 3 × 108 m/s. If the refractive index of glass is 1.5, find the time taken by light to travel a distance of 10 cm in the glass.

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The Huygens–Fresnel principle states that every point on a wavefront is itself the source of spherical wavelets, and the secondary wavelets emanating from different points mutually interfere. The sum of these spherical wavelets forms a new wavefront.


The speed of light in air is 3 × 10<sup>8</sup> m/s. If the refractive index of glass is 1.5, find the time taken by light to travel a distance of 10 cm in the glass.






 
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