A man dressed in all black is walking down a country lane. Suddenly, a large black car with no lights on comes around the corner and screeches to a halt. How did the car’s driver know he was there?

this is tricky

Either he was spiderman and had his peter tingles or the guy in black was carrying some type of reflector or light OR the car saw something else like a white bunny and was avoiding hitting it

Explanation:

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray