when a beam of light travels from denser medium to rarer medium,then it is generally observed that magnitude of angle of incidence is half that of angle of refraction.Then magnitude of incident angle will be? where, R.I=R.I(denser med)/R.I(rarer med)
Answers
Answer:
Explanation:
Refraction of light when it goes from a rarer medium to a denser medium:
In the above fig, incident ray AO gets refracted at point O and bends towards the normal ON' and goes in the direction OB inside the glass slab. Thus, when a ray of light goes from air to glass, it bends towards the normal (at the point of incidence). In this case, the angle of refraction (r) is smaller than the angle of incidence (i).
Water is also an optically denser medium than air, so when a ray of light goes from air into water, it bends towards the normal. Thus, the refraction of light from air to water is similar to the refraction of light from air to glass.
Refraction of light when it goes from a denser medium to a rarer medium:
In the above fig, the incident ray AO gets refracted at point O and bends away from the notmal ON' in the direction OB. Thus, when a ray of light goes from glass into air, it bends aways from the normal. In this case, the angle of refraction (r) is greater than the angle of incidence (i).
Also, water is an optically denser than air, so when a beam of light enters into air, it bends away from the normal.
When a ray of light goes from a rarer medium to a denser medium, its speed decreases or it slows down. On the other hand, when a ray of light goes from a denser medium to rarer medium, its speed increases or it speeds up. So, we can say that a ray of light travelling from a rarer medium to a denser medium slows down and bends towards the normal but when a ray of light travels from a denser medium to a rarer medium, speeds up and bends away from the normal.