Total Internal Reflection Cannot Take Place When Light Goes From:

  1. Water to glass
  2. Water to air
  3. Glass to air
  4. Glass to water
Monis Rasool Professor Asked on 5th July 2015 in Physics.
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Answer: (1). Water to glass

Refraction of light;  when a ray of light from one medium to another medium it changes its speed and gets refracted. if light travelling from the less dense material too dense medium than light ray refracted towards the normal, when light ray travel from dense medium to rare medium then the ray is refracted away from the normal.

RE: Total Internal Reflection Cannot Take Place When Light Goes From:

Total internal reflection is an intersecting effect that can occur when light attempts to move from a medium having given refractive indexes to the medium having a lower refractive index.
Suppose a ray of light travels from medium1 having refractive index 1 to the medium having refractive index 2 . then according to Snell’s law 
sin that = n1 / n2. n1 > n2.
and refraction angle at which we get the total internal reflection is known as the critical angle.

The answer is water to glass because the refractive index of water is less than the refractive index of glass, here the glass is denser medium and water have a rarer medium. ( ref. index of water < ref. index of glass )

vijay Professor Answered on 16th July 2015.
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