KVPY2015PhysicsElectromagnetic Waves
Electromagnetic waves emanating from a point A (in air) are incident on a rectangular block of material M and emerge from the other side as shown. The angles I and r are angles of incidence and refraction when the wave travels from air to the medium. Such paths for the rays are possible
Options
- Aif the material has a refractive index very nearly equal to zero
- Bonly with gamma rays with a wavelength smaller than atomic nuclei of the material
- Cif the material has a refractive index less than zero
- Donly if the wave travels in M with a speed faster than the speed of light in vacuum.
Correct answer
C. if the material has a refractive index less than zero
Step-by-step solution
It is possible for negative only and materials are known as meta materials.