Question

is a ray of light going from water to air be called absolute refractive index

Answer 1

yes because ray of light travel one mediam to another mediam,so the ray of light going from water to air be called absolute refractive index

Answer 2

yes because a ray of light going from one medium to another medium. so, a ray of light going from water to air be called absolute refractive index. Here, water is densor medium and air is rarer medium. so, a ray of light going from one medium to another medium be absolute refractive index.