Electromagnetic waves emanating from a point A (in air) are incid… - Vidyadip

MCQ

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 below. 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,

A
if the material has a refractive index very nearly equal to zero
B
only with gamma rays with a wavelength smaller than the atomic nuclei of the material
✓
if the material has a refractive index less than zero
D
only if the wave travels in $M$ with a speed faster than the speed of light in vacuum

✓

Answer

Correct option: C.

if the material has a refractive index less than zero

c
(c)

In given case, angle of refraction is negative. 'This is possible only when refractive index of matcrial is negative. Negative Index Metamaterial $(NIM)$ is a material for which refractive index has a negative value for an electromagnetic wave over certain frequency range. 'These are artificially produced materials, which found their application in optical signal transmission.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

NEET STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

The work done in stretching an elastic wire per unit volume is

$Assertion :$ Bodies radiate heat at all temperature.
$Reason :$ Rate of radiation of heat is proportional to the fourth power of absolute temperature.

For a medium, refractive indices for violet, red and yellow are $1.62, 1.52$ and $ 1.55$ respectively, then dispersive power of medium will be

Characteristic $X-$ rays are produced due to

A particle of mass $m$ collides with a heavy mass (at rest) elastically and after collision returns with $4/9$ of it's initial kinetic energy. The mass of heavy object is ............... $\mathrm{m}$

A parallel plate capacitor with plates of area $1\,m^2$ each, are at a separation of $0.1\,m.$ If the electric field between the plates is $100\,N/C,$ the magnitude of charge on each plate

Four blocks are connected as shown in the fig. on a horizontal frictionless surface of $m_1 = m_2 = m_3 = m_4$ then $T_3/T_4$ will be

A boy carries a fish in one hand and a bucket(not full) of water in the other hand . If he places the fish in the bucket , the weight now carried by him (assume that water does not spill) :

A point dipole $\vec p = - {p_0}\hat x$ is kept at the origin. The potential and electric field due to this dipole on the $y-$ axis at a distance $d$ are, respectively : (Take $V = 0$ at infinity)

Two particles of equal mass go round a circle of radius $R$ under the action of their mutual gravitational attraction. The speed of each particle is