Can graduate students study chemistry and take a doctoral degree in photography?

Of course. Master students can take cross-disciplinary exams. Because most doctoral majors do not explicitly require that they only enroll this major or similar majors, as long as they meet the requirements in terms of academic qualifications. Therefore, graduate students majoring in chemistry can take a PhD in photography. Photography is an undergraduate major in Chinese universities. I mainly study the basic knowledge and skills of fine arts, aesthetics, composition, photography and photo processing, and take photos, retouch and print in photo studios, newspapers, TV stations and advertising companies.