Endoscopes utilize bundles of optical fibers to explore the body through various

Question

Endoscopes utilize bundles of optical fibers to explore the body through various orifices or minor incisions. These optical fibers consist of a fiber core (with index of refraction n_1) and the surrounding cladding (with index of refraction n_2), as illustrated at right. A ray of light (shown in green) enters the end of the optical fiber at an angle of incidence theta, then proceeds to travel down the length of the fiber, reflecting back and forth off the core-cladding and boundaries. What must be true for this to occur? n_2 = n_1 n_2 > n_1 n_2

Explanation / Answer

INside the fibre,

Total internal reflection of light is happening.

and total internal reflection happens when light ray travels from denser to lighter medium.

for denser medium, n will be greater.

n1 > n2

Ans: n2 < n1

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