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Q.

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


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a

Kerosene

b

Water

c

Mustard oil

d

Glycerine 

answer is D.

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Detailed Solution

In the case of glycerine, a ray of light incident obliquely at the same angle would bend the most.
The refractive index of materials varies depending on the wavelength (and frequency) of light. Therefore, the given materials have their refractive index: kerosene is 1.44, water is 1.33, mustard oil is 1.46, and glycerine is 1.74. Thus, glycerine is the most optically dense and hence has the largest refractive index. Therefore, in the case of glycerine, light bends the most.
 
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