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Which of the following conditions are necessary for total internal reflection to take place at the boundary of two optical media?
I. Light is passing from optically denser medium to optically rarer medium.
II. Light is passing from optically rarer medium to optically denser medium.
III. Angle of incidence is greater than the critical angle.
IV. Angle of incidence is less than the critical angle.
  • a)
    I and III only
  • b)
    II and IV only
  • c)
    III and IV only
  • d)
    I and IV only
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Which of the following conditions are necessary for total internal ref...
Conditions for Total Internal Reflection:

Optical Density:
- Total internal reflection occurs when light is passing from an optically denser medium to an optically rarer medium. This is because the critical angle is determined by the refractive indices of the two media.

Angle of Incidence:
- Total internal reflection only occurs when the angle of incidence is greater than the critical angle. If the angle of incidence is less than the critical angle, refraction rather than total internal reflection will take place.
Therefore, the necessary conditions for total internal reflection to take place at the boundary of two optical media are:
a) Light is passing from an optically denser medium to an optically rarer medium.
b) The angle of incidence is greater than the critical angle.
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Community Answer
Which of the following conditions are necessary for total internal ref...
Because when critical angle is greater the incidence angle
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Which of the following conditions are necessary for total internal reflection to take place at the boundary of two optical media?I. Light is passing from optically denser medium to optically rarer medium.II. Light is passing from optically rarer medium to optically denser medium.III. Angle of incidence is greater than the critical angle.IV. Angle of incidence is less than the critical angle.a)I and III onlyb)II and IV onlyc)III and IV onlyd)I and IV onlyCorrect answer is option 'A'. Can you explain this answer?
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