Characterizing the people of that time as "scientists" is stretching the point beyond where I can accept.
Okay, children, here's a bit of history.

Have you heard of Ibn al-Haytham, sometimes translated as Alhazen or Alhacen? He's widely regarded as the first true scientist and the "father of the modern scientific method". He was a Muslim, born in Iraq in 965 AD and died in Egypt in 1040 AD.
He established experiments as the norm for proof, centuries before European Renaissance scientists, making him a crucial figure in optics, physics, and mathematics.
Here are the Key Components of His Method:
1. Observation & Intuition: Starting with phenomena, he used creative and critical thinking to form initial ideas.
2. Hypothesis: He formulated testable hypotheses about light, such as light traveling in straight lines and being emitted by objects, not eyes.
3. Controlled Experimentation: He designed specific experiments, like projecting images through a small hole, to test his ideas, manipulating variables like light sources and angles.
4. Verification & Repetition:
He stressed that results must be consistent across repeated trials and that conclusions needed independent verification, a core of modern science.
5. Mathematical Reasoning: He linked physical problems to mathematical abstractions, using geometry to describe light's path.
6. Distrust of Authority:
He famously urged, "Don't take my word for it. See for yourself," promoting empirical proof over blind acceptance. He was the author of hundreds of works on diverse subjects, including astronomy, mathematics, logic, philosophy, medicine, theology, and music, but his greatest and most famous work was a 7-volume 'Book of Optics', which, as a photographer, should be of interest to you.
His Book of Optics established foundational principles like light's rectilinear propagation (travels in straight lines), reflection (laws of mirrors), and refraction (bending through media), developed the
camera obscura for image formation, proposed light as both particles and waves, and detailed ocular anatomy, forming the basis of modern optics through rigorous experimentation and empirical methods,
overturning older emission theories of vision.
His works were frequently cited during the scientific revolution by Isaac Newton, Johannes Kepler, Christiaan Huygens, and
Galileo who lived centuries later.