Consider these indices of refraction: glass: 1.52; air: 1.0003; water: 1.333. Based on the refractive indices of three materials, arrange the speed of light through them in decreasing order. 

(A) The speed of light in water > the speed of light in air > the speed of light in glass. 

(B) The speed of light in glass > the speed of light in water > the speed of light in air. 

(C) The speed of light in air > the speed of light in water > the speed of light in glass. 

(D) The speed of light in glass > the speed of light in air > the speed of light in water. 

 

Answer - 

Refractive index and Speed of Light in medium - Teachoo.jpg

Now,

  • Larger refractive index means denser medium
  • And, the speed of light is higher in a rarer medium than a denser medium. 

 

Thus, from our question

  • Since order of Refractive Index is Glass > Water > Air
  • Order of Speed of Light will be opposite, i.e. Glass < Water < Air

 

Thus, option C matches:The speed of light in air > the speed of light in water > the speed of light in glass. 

 

So, the correct answer is (c)  

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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo