EC > GATE 2017 SET-2 > Wave Propagation
The permittivity of water at optical frequencies is 1.75ε0. It is found that an isotropic light source at a distance d under water forms an illuminated circular area of radius 5 m. as shown in the figure. The critical angle is θc.
The value of d (in meter) is
Explanation
Correct : 4.24
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