A ray of light in air strikes a glass surface. Is there a range of angles for which total internal reflection occurs? Explain.
- print Print
- list Cite
Expert Answers
calendarEducator since 2010
write12,551 answers
starTop subjects are Math, Science, and Business
When a ray of light from material A with a refractive index Na enters into material B with a refractive index Nb, the relation between the angle of incidence Ac and the angle of refraction Ar is given by Snell's Law as sin Ac / sin Ar = Nb / Na.
The critical angle is the minimum angle of incidence at which total internal reflection takes place. At this angle Ar = 90 degrees and sin Ar = 1, which gives sin Ac = (Nb/Na). The angle Ac is equal to arc sin (Nb/Na).
Now in the case of a ray of light traveling from air and striking a glass surface, the ratio of the refractive index of glass and the refractive index of air is greater than 1. So the value of arc sin(Nb/Na) is not defined.
Therefore total internal reflection cannot take place in this case.
A ray of light moving from air to glass is always refracted into glass, irrespective of the angle of incidence.
Related Questions
- When a ray of light in air strikes a glass surface is there a range of angles for which total...
- 1 Educator Answer
- What happens to a ray of light when it goes from air to water at an angle.
- 2 Educator Answers
- A ray of light strikes a plane mirror at an angle of 30 degrees. The mirror is rotated by 15...
- 1 Educator Answer
- What is the critical angle for a light ray traveling from diamond into glass?
- 1 Educator Answer
- A scuba diver uses his waterproof flashlight to shine a beam of light so that it strikes the...
- 1 Educator Answer