When studying a physics degree you end up studying many branches of physics that you understand to various levels
for example my degree had a particular slant towards optics and specifically laser physics. It was an applied physics degree. My core studies were - Optics (lenses, ray tracing etc), fibre optics, holography, laser physics and also high voltage electronics and vacuum physics which are used in laser physics.
So when i popped out of university 20 years ago I had a lot of freshly learnt knowledge to a high level in those particular fields which obviously fade over time.
It was a double major as well in computer science.
