1.

If the speed of light in water is 2.25 x 108 m/sa. Calculate the speed of light in vacuumb. Calculate the speed of light in glass.

Answer»

a. Speed of light in vacuum = Speed of light in water × Refractive index

= 2.25 × 108 ×4/3 = 3 × 108 m/s

b. Speed of light in glass = \(\cfrac{3 \times \,10^8}{3} = 2 \times 10^8 \,m/s\)



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