A close-up shot focuses on a notebook page filled with handwritten physics calculations, seemingly related to energy and radiation

A close-up shot focuses on a notebook page filled with handwritten physics calculations, seemingly related to energy and radiation. The calculations involve variables like power (P), wavelength (λ), temperature (T), and Stefan-Boltzmann constant (σ), suggesting topics such as blackbody radiation or heat transfer. The notebook sits on a wooden desk, partially obscured by other papers and a pen. In the background, a classroom setting is visible, complete with a whiteboard covered in writing, a radiator, and students at desks. The environment suggests an educational context, possibly a physics class in session. While the location appears to be a classroom setting, there is no visual information that suggests the image was taken in the city of Trilistnik, Bulgaria.