GATE ECE Plane waves and properties PYQs & Answers — Page 2

Questions 11–13 of 13. Imported answers require independent review unless marked reviewed.

An optical fiber is kept along the

direction. The refractive indices for the electric fields along

and

directions in the fiber are

and

, respectively (

due to the imperfection in the fiber cross-section). The free space wavelength of a light wave propagating in the fiber is 1.5

m. If the lightwave is circularly polarized at the input of the fiber, the minimum propagation distance after which it becomes linearly polarized, in centimetres, is ________.

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The expression for an electric field in free space is

, where

represent the spatial coordinates,

represents time, and

are constants. This electric field

Your answerChoose one option.

does not represent a plane wave.

represents a circularly polarized plane wave propagating normal to the z-axis.

represents an elliptically polarized plane wave propagating along the x-y plane.

represents a linearly polarized plane wave.

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The permittivity of water at optical frequencies is

. It is found that an isotropic light source at a distance

under water forms an illuminated circular area of radius 5 m, as shown in the figure. The critical angle is

Diagram for Electronics and Communication Engineering question 55

The value of

(in meter) is __________

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GATE ECE Plane waves and properties PYQs

Question 53

Question 54

Question 55