Plz tell about the total internal refraction in an equilateral prism with respect to critical angle.
Answers
Answer:
You may have noticed when experimenting with ray boxes and glass blocks in the previous section that sometimes, when you changed the angle of incidence of the light, it was not refracted out into the air, but was reflected back through the block. When the entire incident light ray travelling through an optically denser medium is reflected back at the boundary between that medium and another of lower optical density, instead of passing through and being refracted, this is called total internal reflection.
As we increase the angle of incidence, we reach a point where the angle of refraction is 90° and the refracted ray travels along the boundary of the two media. This angle of incidence is called the critical angle.
If the angle of incidence is bigger than this critical angle, the refracted ray will not emerge from the medium, but will be reflected back into the medium. This is called total internal reflection.