Final answer:
The instrument used to open a body orifice for viewing is called an endoscope. Endoscopes are used to explore the body through various orifices or minor incisions. They transmit light down fiber bundles to illuminate internal parts and transmit the reflected light back out for observation.
Step-by-step explanation:
The instrument used to open a body orifice for viewing is called an endoscope. Endoscopes are devices that are used by doctors to explore the body through various orifices or minor incisions. They transmit light down fiber bundles to illuminate internal parts and transmit the reflected light back out for observation. They can also be used for surgical procedures and obtaining samples.