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 rare angles of incidence and refraction when the wave travels from air to the medium- Such paths for the rays are possibleA- if the material has a refractive index very nearly equal to zeroB- only with gamma rays with a wavelength smaller than atomic nuclei of the materialC- if the material has a refractive index less than zeroD- only if the wave travels in M with a speed faster than the speed of light in vacuum-

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Question

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

if the material has a refractive index very nearly equal to zero

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only with gamma rays with a wavelength smaller than atomic nuclei of the material

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if the material has a refractive index less than zero

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only if the wave travels in M with a speed faster than the speed of light in vacuum.

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Solution

The correct option is C
if the material has a refractive index less than zero

It is possible for negative $μ$ only and materials are known as meta materials.

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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

The correct option is C if the material has a refractive index less than zero It is possible for negativeμ only and materials are known as meta materials.

The correct option is C
if the material has a refractive index less than zero

It is possible for negative $μ$ only and materials are known as meta materials.