Question

If the angle of incidence of ray is greater
than the critical angle at the interface of
core and cladding then the ray travels
Select one:
a. In the cladding
b. In the core
c. In the buffer
d. Along the interface​

Answer 1

Answer:

may be that C

Explanation:

I don't know actually answers

Answer 2

Answer: If ∠i > ∠c, total internal reflection occurs.

Explanation: There are 2 possibilities of light travel:

• Less dense to more dense medium - light is refracted when it reaches the interface or boundary of two different materials.
• More dense to less dense medium - refraction occurs by bending the light ray away from the normal as it comes.

But in this case, when the ray bends more than 90° from the normal, according to the law of reflection, refraction does not take place. Instead, all of the light is reflected inside the dense medium. This phenomena is called Total Internal Reflection (TIR).

Conditions when TIR occur:

1. When the light ray travels from a more dense to less dense medium.
2. Incident angle is greater than the the critical angle in the dense medium or at the interface.
3. When the refraction ray bends more than 90° from the normal ray.