You are given water, mustard oil, glycerine and kerosene. In which of these media a ray of light incident obliquely at same angle would bend the most?

(a) Kerosene

(b) Water

(c) Mustard oil

(d) Glycerine




  • A ray of light incident from a rarer to a denser medium bends towards the normal
  • The extent of the light ray bending can be measured by the angle of refraction
  • The angle of refraction will be highest in the medium with the highest refractive index (or optical density).
  • Glycerine has the highest refractive index from the given options. 
  • Hence, light in glycerine would bend light the most.  

So, the correct answer is (d)

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo