I applied through my university's website and was contacted by a recruiter to arrange a phone call with three interviewers.

During the call, three interviewers asked technical questions, jumping straight into topics on optical engineering and coding.

While prior experience in optical engineering was not required, a basic understanding of the field was expected.

After the technical questions, I was asked detailed questions based on my past experience.

How does a projector work? In general terms, how do you ensure the light is projected properly with the desired quality onto the screen?

How would you write code to characterize an optical sensor with a robot capable of moving in 3D space, with a fiber attached to a laser?

What is Snell's Law?

How do you accurately detect an object's distance from the sensor? What would you need to design such a thing? What would you need to ensure it is designed to be as cheap and as compact as possible?