GATE Electronics and Communications (EC) 2017 Shift 2 Solved Paper
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Question : 65 of 65
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The permittivity of water at optical frequencies is 1.75 ε0. 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 _________.
The value of d (in meter) is _________.
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