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There are three optical media, 1,2 and 3 with their refractive indices μ1 > μ2 > μ3 (TIR-total internal reflection)
  • a)
    When a ray light travels from 3 to 1 no TIR will take place
  • b)
    Critical angle between 1 and 2 is less than the critical angle between 1 and 3
  • c)
    Critical angle between 1 and 2 is more than the critical angle between 1 and 3
  • d)
    Chances of TIR are more when ray of light travels from 1 to 3 compare to the case when it travel from 1 to 2
Correct answer is option 'A,D,C'. Can you explain this answer?
Most Upvoted Answer
There are three optical media, 1,2 and 3 with their refractive indice...
Explanation:

When a ray of light travels from one medium to another, it bends or refracts due to the difference in their refractive indices. If the angle of incidence is greater than the critical angle, total internal reflection takes place.

a) When a ray of light travels from medium 3 to medium 1, no TIR takes place because the refractive index of medium 1 is greater than medium 3. Hence the light bends towards the normal.

b) The critical angle is the angle of incidence at which the angle of refraction becomes 90 degrees. The critical angle between medium 1 and 2 is less than the critical angle between medium 1 and 3 because the refractive index of medium 2 is less than medium 3. Hence the light bends more towards the normal while passing from medium 1 to medium 2.

c) The critical angle between medium 1 and 2 is more than the critical angle between medium 1 and 3 because the refractive index of medium 2 is less than medium 3. Hence the light bends more towards the normal while passing from medium 1 to medium 2.

d) The chances of TIR are more when the ray of light travels from medium 1 to medium 3 compared to the case when it travels from medium 1 to medium 2 because the refractive index of medium 3 is less than medium 1. Hence the light bends more away from the normal while passing from medium 1 to medium 3, increasing the chances of TIR.

Hence the correct answer is A, D, and C.
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Community Answer
There are three optical media, 1,2 and 3 with their refractive indice...
Total internal reflection takes place when ray of light travels from denser to rarer medium
Further,
Since,
θ12 > θ13
Smaller the value of critical angle more the chance of total internal reflection.
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There are three optical media, 1,2 and 3 with their refractive indices μ1 > μ2 > μ3 (TIR-total internal reflection)a)When a ray light travels from 3 to 1 no TIR will take placeb)Critical angle between 1 and 2 is less than the critical angle between 1 and 3c)Critical angle between 1 and 2 is more than the critical angle between 1 and 3d)Chances of TIR are more when ray of light travels from 1 to 3 compare to the case when it travel from 1 to 2Correct answer is option 'A,D,C'. Can you explain this answer?
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