Pe fundul unui vas cu apa (napa= 4/3) de adancime 15 em se afla o sursa de lumina punctiforma. Determina raza cercului luminos care se observa pe suprafata apei (naer = 1).

Ifound this on google “your outer ear collects sound waves and reflects them into a tiny tube called the ear canal. at the end of the ear canal is a thin, skin-like membrane stretched tightly over the opening, called the eardrum.” i hope this you for what your looking for