Which of the following conditions are necessary for total internal reflection to take place at the boundary of two optical media?a)Light is passing from optically denser medium to optically rarer medium.b)Light is passing from optically rarer medium to optically denser medium.c)Angle of incidence is greater than the critical angle.d)Angle of incidence is less than the critical angle.Correct answer is option 'A'. Can you explain this answer?

Question

Answer

Answer

The conditions for total internal reflection are the the light is travelling from an optically denser medium (higher refractive index) to an optically less dense medium (lower refractive index) and that the angle of incidence is greater than the critical angle.

Answer

Option A is correct Explanation for this question !

The conditions for total internal reflection are :-

Light should travel from an optically denser medium (higher refractive index) to an optically less dense medium (lower refractive index) .

Also , the angle of incidence is greater than the critical angle.

Answer

Conditions for Total Internal Reflection

There are certain conditions that need to be fulfilled in order for total internal reflection to occur at the boundary of two optical media. These conditions are as follows:

- Light is passing from optically denser medium to optically rarer medium.
- Angle of incidence is greater than the critical angle.

Explanation

When light travels from one medium to another, it bends due to the change in the speed of light. This bending is known as refraction. The amount of bending depends on the angle of incidence and the refractive indices of the two media. If the angle of incidence is large enough, the refracted ray will bend so much that it will no longer pass through the boundary and will instead reflect back into the original medium. This is known as total internal reflection.

In order for total internal reflection to occur, the following conditions must be met:

- Light must be passing from a more optically dense medium to a less optically dense medium. This is because the refractive index of the first medium must be greater than the refractive index of the second medium in order for the critical angle to exist.
- The angle of incidence must be greater than the critical angle. The critical angle is the angle of incidence at which the refracted ray would travel along the boundary between the two media. If the angle of incidence is greater than the critical angle, the refracted ray will not pass through the boundary and instead will reflect back into the original medium.

Conclusion

In summary, total internal reflection occurs when light travels from a more optically dense medium to a less optically dense medium and the angle of incidence is greater than the critical angle. These conditions are necessary for total internal reflection to occur at the boundary of two optical media.

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