"Just some guesses, that's all..."
Then he pointed at the metal plate not far away and said:
"Dean Huai Wei, you don't often take part in frontline research, so you might not be aware of some situations."
"The imaging boards we commonly use in optical experiments are usually composite boards based on marble, mainly to display images clearly."
"As for metal plates of this kind, they're mostly used in reflection experiments, like with sound waves or light, etc..."
"Since Luo Feng requested the experiment be carried out after dark, it must have something to do with light."
"So I think this metal plate is used to reflect light."
Saying this, he glanced over the equipment setup, rubbed his chin, and finally concluded:
"So, assuming nothing unexpected happens, this setup should work like—first the coil is powered up and emits light, then the light is reflected by the metal plate, and some kind of image appears on the receiver..."
