Final answer:
Endoscopes are instruments used to view internal organs through small openings in the body. They work by transmitting light down fiber bundles to illuminate the internal parts, and the reflected light is then transmitted back out through another bundle to be observed. Endoscopes can be used to perform surgeries, collect samples, and diagnose internal physical problems.
Step-by-step explanation:
Endoscopes are instruments used to view internal organs through small openings in the body. They work by transmitting light down fiber bundles to illuminate the internal parts, and the reflected light is then transmitted back out through another bundle to be observed. Endoscopes can be used to perform surgeries, collect samples, and diagnose internal physical problems. They are particularly useful for non-intrusive diagnostics, such as determining the extent of cancers in the stomach and bowel.